release/doc/en_US.ISO8859-1/relnotes/article.xml

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   4 <!ENTITY % release PUBLIC "-//FreeBSD//ENTITIES Release Specification//EN" "release.ent">
   5  %release;
   6 <!ENTITY % sponsor PUBLIC "-//FreeBSD//ENTITIES Sponsor Specification//EN" "sponsor.ent">
   7  %sponsor;
   8 <!ENTITY % vendor PUBLIC "-//FreeBSD//ENTITIES Vendor Specification//EN" "vendor.ent">
   9  %vendor;
  10 <!ENTITY security SYSTEM "../../share/xml/security.xml">
  11 <!ENTITY errata SYSTEM "../../share/xml/errata.xml">
  12 ]>
  13 <article xmlns="http://docbook.org/ns/docbook"
  14   xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
  15
  16   <info>
  17     <title>&os; &release.current; Release Notes</title>
  18
  19     <author>
  20       <orgname>The &os; Project</orgname>
  21     </author>
  22
  23     <pubdate>$FreeBSD$</pubdate>
  24
  25     <!-- Last rev: 282482 -->
  26
  27     <copyright>
  28       <year>2015</year>
  29       <holder role="mailto:doc@FreeBSD.org">The &os; Documentation
  30         Project</holder>
  31     </copyright>
  32
  33     <legalnotice xml:id="trademarks" role="trademarks">
  34       &tm-attrib.freebsd;
  35       &tm-attrib.ibm;
  36       &tm-attrib.ieee;
  37       &tm-attrib.intel;
  38       &tm-attrib.sparc;
  39       &tm-attrib.general;
  40     </legalnotice>
  41
  42     <abstract>
  43       <para>The release notes for &os; &release.current; contain
  44         a summary of the changes made to the &os; base system on the
  45         &release.branch; development line.  This document lists
  46         applicable security advisories that were issued since the last
  47         release, as well as significant changes to the &os; kernel and
  48         userland.  Some brief remarks on upgrading are also
  49         presented.</para>
  50     </abstract>
  51   </info>
  52
  53   <sect1 xml:id="intro">
  54     <title>Introduction</title>
  55
  56     <para>This document contains the release notes for &os;
  57       &release.current;.  It describes recently added, changed, or
  58       deleted features of &os;.  It also provides some notes on
  59       upgrading from previous versions of &os;.</para>
  60
  61     <para releasetype="current">The &release.type; distribution to
  62       which these release notes apply represents the latest point
  63       along the &release.branch; development branch since
  64       &release.branch; was created.  Information regarding pre-built,
  65       binary &release.type; distributions along this branch can be
  66       found at <uri
  67         xlink:href="&release.url;">&release.url;</uri>.</para>
  68
  69     <para releasetype="snapshot">The &release.type; distribution to
  70       which these release notes apply represents a point along the
  71       &release.branch; development branch between &release.prev; and
  72       the future &release.next;.  Information regarding pre-built,
  73       binary &release.type; distributions along this branch can be
  74       found at <uri
  75         xlink:href="&release.url;">&release.url;</uri>.</para>
  76
  77     <para releasetype="release">This distribution of &os;
  78       &release.current; is a &release.type; distribution.  It can be
  79       found at <uri xlink:href="&release.url;">&release.url;</uri> or
  80       any of its mirrors.  More information on obtaining this (or
  81       other) &release.type; distributions of &os; can be found in the
  82       <link
  83         xlink:href="&url.books.handbook;/mirrors.html"><quote>Obtaining
  84           &os;</quote> appendix</link> to the <link
  85         xlink:href="&url.books.handbook;/">&os;
  86         Handbook</link>.</para>
  87
  88     <para>All users are encouraged to consult the release errata
  89       before installing &os;.  The errata document is updated with
  90       <quote>late-breaking</quote> information discovered late in the
  91       release cycle or after the release.  Typically, it contains
  92       information on known bugs, security advisories, and corrections
  93       to documentation.  An up-to-date copy of the errata for &os;
  94       &release.current; can be found on the &os; Web site.</para>
  95
  96     <para>This document describes the most user-visible new or changed
  97       features in &os; since &release.prev;.  In general, changes
  98       described here are unique to the &release.branch; branch unless
  99       specifically marked as &merged; features.</para>
 100
 101     <para>Typical release note items document recent security
 102       advisories issued after &release.prev;, new drivers or hardware
 103       support, new commands or options, major bug fixes, or
 104       contributed software upgrades.  They may also list changes to
 105       major ports/packages or release engineering practices.  Clearly
 106       the release notes cannot list every single change made to &os;
 107       between releases; this document focuses primarily on security
 108       advisories, user-visible changes, and major architectural
 109       improvements.</para>
 110   </sect1>
 111
 112   <sect1 xml:id="upgrade">
 113     <title>Upgrading from Previous Releases of &os;</title>
 114
 115     <para arch="amd64,i386">Binary upgrades between RELEASE versions
 116       (and snapshots of the various security branches) are supported
 117       using the &man.freebsd-update.8; utility.  The binary upgrade
 118       procedure will update unmodified userland utilities, as well as
 119       unmodified GENERIC kernels distributed as a part of an official
 120       &os; release.  The &man.freebsd-update.8; utility requires that
 121       the host being upgraded have Internet connectivity.</para>
 122
 123     <para>Source-based upgrades (those based on recompiling the &os;
 124       base system from source code) from previous versions are
 125       supported, according to the instructions in
 126       <filename>/usr/src/UPDATING</filename>.</para>
 127
 128     <important>
 129       <para>Upgrading &os; should only be attempted after backing up
 130         <emphasis>all</emphasis> data and configuration files.</para>
 131     </important>
 132   </sect1>
 133
 134   <sect1 xml:id="security-errata">
 135     <title>Security and Errata</title>
 136
 137     <para>This section lists the various Security Advisories and
 138       Errata Notices since &release.prev;.</para>
 139
 140     <sect2 xml:id="security">
 141       <title>Security Advisories</title>
 142
 143       &security;
 144     </sect2>
 145
 146     <sect2 xml:id="errata">
 147       <title>Errata Notices</title>
 148
 149       &errata;
 150     </sect2>
 151   </sect1>
 152
 153   <sect1 xml:id="userland">
 154     <title>Userland</title>
 155
 156     <para>This section covers changes and additions to userland
 157       applications, contributed software, and system utilities.</para>
 158
 159     <sect2 xml:id="userland-config">
 160       <title>Userland Configuration Changes</title>
 161
 162       <para revision="266463">The default &man.newsyslog.conf.5; now
 163         includes files in the
 164         <filename>/etc/newsyslog.conf.d/</filename> and
 165         <filename>/usr/local/etc/newsyslog.conf.d/</filename>
 166         directories by default for &man.newsyslog.8;.</para>
 167
 168       <para revision="270675">The &man.mailwrapper.8; utility has been
 169         updated to use &man.mailer.conf.5; from the
 170         <literal>LOCALBASE</literal> environment variable, which
 171         defaults to <filename class="directory">/usr/local</filename>
 172         if unset.</para>
 173
 174       <para revision="272350">The <literal>MK_ARM_EABI</literal>
 175         &man.src.conf.5; option has been removed.</para>
 176     </sect2>
 177
 178     <sect2 xml:id="userland-programs">
 179       <title>Userland Application Changes</title>
 180
 181       <para revision="258838" contrib="sponsor" sponsor="&ff;,
 182         &google;" sponsorurl="">The &man.casperd.8; daemon has been
 183         added, which provides access to functionality that is not
 184         available in the <quote>capability mode</quote>
 185         sandbox.</para>
 186
 187       <para revision="260594">When unable to load a kernel module with
 188         &man.kldload.8;, a message informing to view output of
 189         &man.dmesg.8; is now printed, opposed to the previous output
 190         <quote>Exec format error.</quote>.</para>
 191
 192       <para revision="260910">Allow &man.pciconf.8; to identify PCI
 193         devices that are attached to a driver to be identified by
 194         their device name instead of just the selector.  Additionally,
 195         an optional device argument to the <literal>-l</literal> flag
 196         to restrict the output to only listing details about a single
 197         device.</para>
 198
 199       <para revision="260913">A new flag, <quote>onifconsole</quote>
 200         has been added to <filename>/etc/ttys</filename>.  This allows
 201         the system to provide a login prompt via serial console if the
 202         device is an active kernel console, otherwise it is equivalent
 203         to <literal>off</literal>.</para>
 204
 205       <para revision="260926">Support for displaying VPD for PCI
 206         devices via &man.pciconf.8; has been added.</para>
 207
 208       <para revision="261498">&man.ping.8; protects against malicious
 209         network packets using the Capsicum framework to drop
 210         privileges.</para>
 211
 212       <para revision="265229">The &man.ps.1; utility has been
 213         updated to include the <literal>-J</literal> flag, used to
 214         filter output by matching &man.jail.8; IDs and names.
 215         Additionally, argument <literal>0</literal> can be used to
 216         <literal>-J</literal> to only list processes running on the
 217         host system.</para>
 218
 219       <para revision="265249">The &man.top.1; utility has been updated
 220         to filter by &man.jail.8; ID or name, in followup to the
 221         &man.ps.1; change in <literal>r265229</literal>.</para>
 222
 223       <para revision="266209">The &man.pmcstat.8; utility has been
 224         updated to include a new flag, <literal>-l</literal>, which
 225         ends event collection after the specified number of
 226         seconds.</para>
 227
 228       <para revision="270745">The &man.ps.1; utility has been updated
 229         to include a new keyword, <quote>tracer</quote>, which
 230         displays the <acronym>PID</acronym> of the tracing
 231         process.</para>
 232
 233       <para revision="271482">Support for adding empty partitions has
 234         been added to the &man.mkimg.1; utility.</para>
 235
 236       <para revision="272166">The &man.primes.6; utility has been
 237         updated to correctly enumerate prime numbers between
 238         <literal>4295098369</literal> and
 239         <literal>3825123056546413050</literal>, which prior to this
 240         change, it would be possible for returned values to be
 241         incorrectly identified as prime numbers.</para>
 242
 243       <para revision="272198">The &man.mkimg.1; utility has been
 244         updated to include three options used to print information
 245         about &man.mkimg.1; itself:</para>
 246
 247       <informaltable frame="none" pgwide="0">
 248         <tgroup cols="2">
 249           <colspec colwidth="1*"/>
 250           <colspec colwidth="1*"/>
 251           <thead>
 252             <row>
 253               <entry>Option</entry>
 254               <entry>Output</entry>
 255             </row>
 256           </thead>
 257
 258           <tbody>
 259             <row>
 260               <entry><literal>--version</literal></entry>
 261               <entry>The current version of the &man.mkimg.1;
 262                 utility</entry>
 263             </row>
 264
 265             <row>
 266               <entry><literal>--formats</literal></entry>
 267               <entry>The disk image file formats supported by
 268                 &man.mkimg.1;</entry>
 269             </row>
 270
 271             <row>
 272               <entry><literal>--schemes</literal></entry>
 273               <entry>The partition schemes supported by
 274                 &man.mkimg.1;</entry>
 275             </row>
 276           </tbody>
 277         </tgroup>
 278       </informaltable>
 279
 280       <para revision="272488">Userland &man.ctf.5; support in
 281         &man.dtrace.1; has been added.  With this change,
 282         &man.dtrace.1; is able to resolve type info for function and
 283         <acronym>USDT</acronym> probe arguments, and function return
 284         values.</para>
 285
 286       <para revision="274960">The &man.elfdump.1; utility has been
 287         updated to support capability mode provided by
 288         &man.capsicum.4;.</para>
 289
 290       <para revision="275680" contrib="sponsor" sponsor="&ff;">The
 291         &man.fstyp.8; utility has been added, which is used to
 292         determine the filesystem on a specified device.</para>
 293
 294       <para revision="276881">The <literal>libedit</literal> library
 295         has been updated to support <acronym>UTF</acronym>-8, which
 296         additionally provides unicode support to &man.sh.1;.</para>
 297
 298       <para revision="277166" arch="powerpc">The &man.ptrace.2; system
 299         call has been updated include support for Altivec registers on
 300         &os;/&arch.powerpc;.</para>
 301
 302       <para revision="278320">A new device control utility,
 303         &man.devctl.8; has been added, which allows making
 304         administrative changes to individual devices, such as
 305         attaching and detaching drivers, and enabling and disabling
 306         devices.  The &man.devctl.8; utility uses the new
 307         &man.devctl.3; library.</para>
 308
 309       <para revision="279315" contrib="sponsor" sponsor="&ff;">The
 310         &man.uefisign.8; utility has been added.</para>
 311
 312       <para revision="279571" contrib="sponsor"
 313         sponsor="&scaleengine;">The &man.freebsd-update.8; utility has
 314         been updated to prevent fetching updated binary patches when
 315         a previous upgrade has not been thoroughly completed.</para>
 316
 317       <para revision="279122" contrib="sponsor"
 318         sponsor="&juniper;">The &man.netstat.1; utility has been
 319         updated to link against the &man.libxo.3; shared
 320         library.</para>
 321
 322       <para revision="280870">A regression in the &man.libarchive.3;
 323         library that would prevent a directory from being included in
 324         the archive when <literal>--one-file-system</literal> is used
 325         has been fixed.</para>
 326
 327       <para revision="281311" contrib="sponsor" sponsor="&ff;">The
 328         &man.ar.1; utility has been updated to set
 329         <literal>ARCHIVE_EXTRACT_SECURE_SYMLINKS</literal> and
 330         <literal>ARCHIVE_EXTRACT_SECURE_NODOTDOT</literal> to disallow
 331         directory traversal when extracting an archive, similar to
 332         &man.tar.1;.</para>
 333
 334       <para revision="282208" contrib="sponsor"
 335         sponsor="&multiplay;">The &man.chflags.1;, &man.chgrp.1;,
 336         &man.chmod.1;, and &man.chown.8; utilities now affect symbolic
 337         links when the <literal>-R</literal> flag is specified, as
 338         documented in &man.symlink.7;.</para>
 339
 340       <para revision="281617">A race condition in &man.wc.1; that
 341         would cause final results to be sent to &man.stderr.4; when
 342         receiving the <literal>SIGINFO</literal> signal has been
 343         fixed.</para>
 344
 345       <para revision="284297" contrib="sponsor"
 346         sponsor="&clusterhq;">The &man.lockstat.1; utility has been
 347         updated with several improvements:</para>
 348
 349       <itemizedlist>
 350         <listitem>
 351           <para>Spin locks are now reported as the amount of time
 352             spinning, instead of loop iterations.</para>
 353         </listitem>
 354
 355         <listitem>
 356           <para>Reader locks are now recognized as adaptive and can
 357             spin on &os;.</para>
 358         </listitem>
 359
 360         <listitem>
 361           <para>Lock aquisition events for successful reader try-lock
 362             events are now reported.</para>
 363         </listitem>
 364
 365         <listitem>
 366           <para>Spin-and-block events that occur before lock
 367             acquisition are now reported.</para>
 368         </listitem>
 369       </itemizedlist>
 370     </sect2>
 371
 372     <sect2 xml:id="userland-contrib">
 373       <title>Contributed Software</title>
 374
 375       <para revision="258884" contrib="sponsor"
 376         sponsor="&darpa_afrl;">&man.lldb.1; has been updated to
 377         upstream snapshot version r196259.</para>
 378
 379       <para revision="259626">Timezone data files have been updated to
 380         version 2013i.</para>
 381
 382       <para revision="260445">&man.byacc.1; has been updated to
 383         version 20140101.</para>
 384
 385       <para revision="261071">&man.jemalloc.3; has been updated to
 386         version 3.5.0.</para>
 387
 388       <para revision="261283"><application>libc++</application> has
 389         been updated to version 3.4.</para>
 390
 391       <para revision="261320"><application>OpenSSH</application> has
 392         been updated to 6.5p1.</para>
 393
 394       <para revision="261344"><application>mdocml</application> has
 395         been updated to version 1.12.3.</para>
 396
 397       <para revision="261991"><application>LLVM</application> and
 398         <application>Clang</application> have been updated to
 399         version 3.4.</para>
 400
 401       <para revision="266527"
 402         role="merged"><application>Sendmail</application> has been
 403         updated from 8.14.7 to 8.14.9.</para>
 404
 405       <para revision="276577"><application>file</application> has been
 406         updated to version 5.22.</para>
 407
 408       <para revision="275718">The <application>binutils</application>
 409         suite of utilities has been updated to include upstream
 410         patches that add new relocations for &arch.powerpc;
 411         support.</para>
 412
 413       <para revision="276398" contrib="sponsor" sponsor="&ff;">The
 414         <application>ELF Tool Chain</application> has been updated to
 415         upstream revision r3136.</para>
 416
 417       <para revision="276551">The <application>texinfo</application>
 418         utility and <literal>info</literal> pages were removed from
 419         the base system.  The <filename
 420           role="package">print/texinfo</filename> port should be
 421         installed on systems where <literal>info</literal> pages are
 422         needed.</para>
 423
 424       <para revision="276796" contrib="sponsor" sponsor="&ff;">The ELF
 425         object manipulation tools
 426         <application>addr2line</application>,
 427         <application>elfcopy (strip)</application>,
 428         <application>nm</application>,
 429         <application>readelf</application>,
 430         <application>size</application>, and
 431         <application>strings</application> were switched to the
 432         versions from the ELF Tool Chain project.</para>
 433
 434       <para revision="276881">The <literal>libedit</literal> library
 435         has been updated to include <acronym>UTF-8</acronym> support,
 436         adding <acronym>UTF-8</acronym> support to the &man.sh.1;
 437         shell.</para>
 438
 439       <para revision="278433">The &man.xz.1; utility has been updated
 440         to support multi-threaded compression.</para>
 441
 442       <para revision="280297"><application>OpenSSL</application> has
 443         been updated to version 1.0.1m.</para>
 444
 445       <para revision="280932" contrib="sponsor" sponsor="&ff;">The
 446         <application>elftoolchain</application> utilities have been
 447         updated to version 3179.</para>
 448
 449       <para revision="281316">The &man.xz.1; utility has been updated
 450         to version 5.2.1.</para>
 451
 452       <para revision="281373">The &man.nvi.1; utility has been updated
 453         to version 2.1.3.</para>
 454
 455       <para revision="281396">The &man.acpi.4; subsystem has been
 456         updated to version 20150410.</para>
 457
 458       <para revision="281806">The &man.wpa.supplicant.8; and
 459         &man.hostapd.8; utilities have been updated to version
 460         2.4.</para>
 461
 462       <para revision="282089">The &man.unbound.8; utility has been
 463         updated to version 1.5.3.</para>
 464
 465       <para revision="282434" contrib="sponsor" sponsor="&ff;">The
 466         &man.resolvconf.8; utility has been updated to version
 467         3.7.0.</para>
 468
 469       <para revision="284254"><application>bmake</application> has
 470         been updated to version 20150606.</para>
 471     </sect2>
 472
 473     <sect2 xml:id="userland-installer">
 474       <title>Installation and Configuration Tools</title>
 475
 476       <para revision="271539">The &man.bsdinstall.8; partition editor
 477         and &man.sade.8; utility have been updated to include native
 478         <acronym>ZFS</acronym> support.</para>
 479
 480       <para revision="272274">The &os; installation utility,
 481         &man.bsdinstall.8;, has been updated to set the
 482         <literal>canmount</literal> &man.zfs.8; property to
 483         <literal>off</literal> for the <filename
 484           class="directory">/var</filename> dataset, preventing the
 485         contents of directories within <filename
 486           class="directory">/var</filename> from conflicting when
 487         using multiple boot environments, such as that provided by
 488         <filename role="package">sysutils/beadm</filename>.</para>
 489
 490       <para revision="274394">The &man.bsdconfig.8; utility has been
 491         updated to skip the initial &man.tzsetup.8;
 492         <acronym>UTC</acronym> versus wall-clock time prompt when run
 493         in a virtual machine, determined when the
 494         <literal>kern.vm_guest</literal> &man.sysctl.8; is set to
 495         <literal>1</literal>.</para>
 496
 497       <para revision="275874">The &man.bsdinstall.8; utility has been
 498         updated to use the new &man.dpv.3; library to display progress
 499         when extracting the &os; distributions.</para>
 500     </sect2>
 501
 502     <sect2 xml:id="userland-rc">
 503       <title><filename class="directory">/etc/rc.d</filename>
 504         Scripts</title>
 505
 506       <para revision="270676">The &man.rc.8; subsystem has been
 507         updated to allow configuring services in <filename
 508           class="directory">&dollar;{LOCALBASE}/etc/rc.conf.d/</filename>.
 509         If <literal>LOCALBASE</literal> is unset, it defaults to
 510         <filename class="directory">/usr/local</filename>.</para>
 511
 512       <para revision="275299">The <filename>mrouted</filename>
 513         &man.rc.8; script has been removed from the base system.  An
 514         equivalent script is available from the <filename
 515           role="package">net/mrouted</filename> port.</para>
 516
 517       <para revision="279463" contrib="sponsor"
 518         sponsor="&sandvine;">A new &man.rc.8; script,
 519         <filename>iovctl</filename>, has been added, which allows
 520         automatically starting the &man.iovctl.8; utility at
 521         boot.</para>
 522     </sect2>
 523
 524     <sect2 xml:id="userland-periodic">
 525       <title><filename class="directory">/etc/periodic</filename>
 526         Scripts</title>
 527
 528       <para revision="271321">The daily &man.periodic.8; script
 529         <filename>110.clean-tmps</filename> has been updated to avoid
 530         crossing filesystem mount boundaries when cleaning files in
 531         <filename class="directory">/tmp</filename>.</para>
 532     </sect2>
 533
 534     <sect2 xml:id="userland-libraries">
 535       <title>Runtime Libraries and API</title>
 536
 537       <para revision="265995">The Blowfish &man.crypt.3; default
 538         format has been changed to
 539         <literal>&dollar;2b&dollar;</literal>.</para>
 540
 541       <para revision="268461">The &man.readline.3; library is now
 542         statically linked in software within the base system, and the
 543         shared library is no longer installed, allowing the Ports
 544         Collection to use a modern version of the library.</para>
 545
 546       <para revision="272273">The &man.strptime.3; library has been
 547         updated to add support for <acronym>POSIX</acronym>-2001
 548         features <literal>%U</literal> and
 549         <literal>%W</literal>.</para>
 550
 551       <para revision="272842,272848" contrib="sponsor"
 552         sponsor="&ff;">The &man.dl.iterate.phdr.3; library has been
 553         changed to always return the path name of the
 554         <acronym>ELF</acronym> object in the
 555         <literal>dlpi_name</literal> structure member.</para>
 556
 557       <para revision="273562" contrib="sponsor"
 558         sponsor="&juniper;">The &man.libxo.3; library has been
 559         imported to the base system.</para>
 560
 561       <para revision="273806" contrib="sponsor" sponsor="&chelsio;">A
 562         userland library for Chelsio Terminator 5 based iWARP cards
 563         has been added, allowing userland <acronym>RDMA</acronym>
 564         applications to work over compatible
 565         <acronym>NIC</acronym>s.</para>
 566
 567       <para revision="274987">The &man.gpio.3; library has been added,
 568         providing a wrapper around the &man.gpio.4; kernel
 569         interface.</para>
 570
 571       <para revision="277610">The <literal>futimens()</literal> and
 572         <literal>utimensat()</literal> system calls have been
 573         added.  See &man.utimensat.2; for more information.</para>
 574
 575       <para revision="278934">The &man.elf.3; compile-time dependency
 576         has been removed from <filename>dtri.o</filename>, which
 577         allows adding <application>DTrace</application> probes to
 578         userland applications and libraries without also linking
 579         against &man.elf.3;.</para>
 580
 581       <para revision="279186">The &man.setmode.3; function has been
 582         updated to consistently set <literal>errno</literal> on
 583         failure.</para>
 584
 585       <para revision="279663">The &man.qsort.3; functions have been
 586         updated to be able to handle 32-bit aligned data on 64-bit
 587         platforms, also providing a significant improvement in 32-bit
 588         workloads.</para>
 589
 590       <para revision="281130">Several standard include headers have
 591         been updated to use of <application>gcc</application>
 592         attributes, such as <literal>__result_use_check()</literal>,
 593         <literal>__alloc_size()</literal>, and
 594         <literal>__nonnull()</literal>.</para>
 595
 596       <para revision="281845">Support for file verification in
 597         <acronym>MAC</acronym> has been added.</para>
 598
 599       <para revision="282973" contrib="sponsor" sponsor="&ff;">The
 600         <literal>libgomp</literal> library is now only built when
 601         building <acronym>GCC</acronym> from the base system.  An
 602         up-to-date version is available in the Ports Collection as
 603         <filename
 604           role="package">devel/libiomp5-devel</filename>.</para>
 605
 606       <para revision="282988">The <filename>stdlib.h</filename> and
 607         <filename>malloc.h</filename> headers have been updated to
 608         make use of the <application>gcc</application>
 609         <literal>alloc_align()</literal> attribute.</para>
 610
 611       <para revision="284483" contrib="sponsor"
 612         sponsor="&scaleengine;">The Blowfish &man.crypt.3; library
 613         has been updated to support &dollar;2y&dollar; hashes.</para>
 614     </sect2>
 615
 616     <sect2 xml:id="userland-abi">
 617       <title>ABI Compatibility</title>
 618
 619       <para revision="271982">The &linux; compatibility version has
 620         been updated to <literal>2.6.18</literal>.  The
 621         <literal>compat.linux.osrelease</literal> &man.sysctl.8; is
 622         evaluated when building the <filename
 623           role="package">emulators/linux-c6</filename> and related
 624         ports.</para>
 625     </sect2>
 626   </sect1>
 627
 628   <sect1 xml:id="kernel">
 629     <title>Kernel</title>
 630
 631     <para>This section covers changes to kernel configurations, system
 632       tuning, and system control parameters that are not otherwise
 633       categorized.</para>
 634
 635     <sect2 xml:id="kernel-bugfix">
 636       <title>Kernel Bug Fixes</title>
 637
 638       <para revision="265876">A kernel bug that inhibited proper
 639         functionality of the <literal>dev.cpu.0.freq</literal>
 640         &man.sysctl.8; on &intel; processors with Turbo
 641         Boost&nbsp;&trade; enabled has been fixed.</para>
 642
 643       <para revision="271697" arch="powerpc">Support for
 644         &man.dtrace.1; stack tracing has been fixed for
 645         &os;/&arch.powerpc;, using the <literal>trapexit()</literal>
 646         and <literal>asttrapexit()</literal> functions instead of
 647         checking within addressed kernel space.</para>
 648
 649       <para revision="272089">A bug in &man.ipfw.4; that could
 650         potentially lead to a kernel panic when using &man.dummynet.4;
 651         at layer 2 has been fixed.</para>
 652
 653       <para revision="280930" contrib="sponsor" sponsor="&mitail;">The
 654         kernel <acronym>RPC</acronym> has been updated to include
 655         several enhancements:</para>
 656
 657       <itemizedlist>
 658         <listitem>
 659           <para>The 45 MiB limit on requests queued for
 660             &man.nfsd.8; threads has been removed.</para>
 661         </listitem>
 662
 663         <listitem>
 664           <para>Avoids unnecessary throttling by not deferring
 665             accounting for completed requests.</para>
 666         </listitem>
 667
 668         <listitem>
 669           <para>Fixes an integer overflow and signedness bugs.</para>
 670         </listitem>
 671       </itemizedlist>
 672
 673       <para revision="281261" arch="powerpc">Support for
 674         &man.dtrace.1; has been added for the
 675         Book-E&nbsp;&trade;.</para>
 676     </sect2>
 677
 678     <sect2 xml:id="kernel-config">
 679       <title>Kernel Configuration</title>
 680
 681       <para revision="266531">The <literal>IMAGACT_BINMISC</literal>
 682         kernel configuration option has been enabled by default,
 683         which enables application execution through emulators, such
 684         as <application>Qemu</application>.</para>
 685
 686       <para revision="268045">The <literal>VT</literal> kernel
 687         configuration file has been removed, and the &man.vt.4;
 688         driver is included in the <literal>GENERIC</literal> kernel.
 689         To enable &man.vt.4;, enter <literal>set kern.vty=vt</literal>
 690         at the &man.loader.8; prompt during boot, or add
 691         <literal>kern.vty=vt</literal> to &man.loader.conf.5; and
 692         reboot the system.</para>
 693
 694       <para revision="277904">The &man.config.8; utility has been
 695         updated to allow using a non-standard <filename
 696           class="directory">src/</filename> tree, specified as an
 697         argument to the <literal>-s</literal> flag.</para>
 698
 699       <para revision="277990" arch="powerpc64">The
 700         &os;/&arch.powerpc64; kernel now builds as
 701         a position-independent executable, allowing the kernel to be
 702         loaded into and run from any physical or virtual
 703         address.</para>
 704
 705       <important>
 706         <para>This change requires an update to &man.loader.8;.
 707           The userland and kernel must be updated before rebooting the
 708           system.</para>
 709       </important>
 710
 711       <para revision="279189" contrib="sponsor" sponsor="&ff;"
 712         arch="powerpc">Kernel support for Vector-Scalar eXtension
 713         (<acronym>VSX</acronym>) found on POWER7 and POWER8 hardware
 714         has been added.</para>
 715
 716       <para revision="279252" contrib="sponsor" sponsor="&ff;"
 717         arch="powerpc">The &man.pmap.9; implementation for 64-bit
 718         &powerpc; processors has been overhaulded to improve
 719         concurrency.</para>
 720
 721       <para revision="283959" contrib="sponsor"
 722         sponsor="&limelight;">A new kernel configuration option,
 723         <literal>EM_MULTIQUEUE</literal>, has been added which enables
 724         multi-queue support in the &man.em.4; driver.</para>
 725
 726       <note>
 727         <para>Multi-queue support in the &man.em.4; driver is not
 728           officially supported by &intel;.</para>
 729       </note>
 730     </sect2>
 731
 732     <sect2 xml:id="kernel-sysctl">
 733       <title>System Tuning and Controls</title>
 734
 735       <para revision="275140" contrib="sponsor" sponsor="&ff;">The
 736         &man.hwpmc.4; default and maximum callchain depths have been
 737         increased.  The default has been increased from 16 to 32, and
 738         the maximum increased from 32 to 128.</para>
 739
 740       <para revision="279361">The <literal>kern.osrelease</literal>
 741         and <literal>kern.osreldate</literal> are now configurable
 742         &man.jail.8; parameters.</para>
 743
 744       <para revision="280308,280949" contrib="sponsor"
 745         sponsor="&ix;, &ff;">The &man.devfs.5; device filesystem has
 746         been changed to update timestamps for read/write operations
 747         using seconds precision.  A new &man.sysctl.8;,
 748         <literal>vfs.devfs.dotimes</literal> has been added, which
 749         when set to a non-zero value, enables default precision
 750         timestamps for these operations.</para>
 751
 752       <para revision="282213" contrib="sponsor" sponsor="&ff;">A new
 753         &man.sysctl.8;, <literal>kern.racct.enable</literal>, has been
 754         added, which when set to a non-zero value allows using
 755         &man.rctl.8; with the <literal>GENERIC</literal> kernel.
 756         A new kernel configuration option,
 757         <literal>RACCT_DISABLED</literal> has also been added.</para>
 758
 759       <para revision="282901" contrib="sponsor" sponsor="&ff;">The
 760         <literal>GENERIC</literal> kernel configuration now includes
 761         <literal>RACCT</literal> and <literal>RCTL</literal> by
 762         default.</para>
 763
 764       <note>
 765         <para>To enable <literal>RACCT</literal> and
 766           <literal>RCTL</literal> on a system using the
 767           <literal>GENERIC</literal> kernel configuration, add
 768           <literal>kern.racct.enable=1</literal> to
 769           &man.loader.conf.5;, and reboot the system.</para>
 770       </note>
 771
 772       <para revision="283136" contrib="sponsor"
 773         sponsor="&limelight;">A new &man.sysctl.8;,
 774         <literal>net.inet.tcp.hostcache.purgenow</literal>, has
 775         been added, which when set to <literal>1</literal> during
 776         runtime will flush all
 777         <literal>net.inet.tcp.hostcache</literal> entries.</para>
 778     </sect2>
 779   </sect1>
 780
 781   <sect1 xml:id="drivers">
 782     <title>Devices and Drivers</title>
 783
 784     <para>This section covers changes and additions to devices and
 785       device drivers since &release.prev;.</para>
 786
 787     <sect2 xml:id="drivers-device">
 788       <title>Device Drivers</title>
 789
 790       <para revision="260903">Support for GPS ports has been added to
 791         &man.uhso.4;.</para>
 792
 793       <para revision="265132">The &man.full.4; device has been added,
 794         and the <literal>lindev(4)</literal> device has been removed.
 795         Prior to this change, <literal>lindev(4)</literal> provided
 796         only the <filename>/dev/full</filename> character device,
 797         returning <literal>ENOSPC</literal> on write attempts.  As
 798         this device is not specific to &linux;, a native &os; version
 799         has been added.</para>
 800
 801       <para revision="271705">Hardware context support has been
 802         added to the <literal>drm/i915</literal> driver, adding
 803         support for <application>Mesa</application> 9.2 and
 804         later.</para>
 805
 806       <para revision="273178">The &man.vt.4; driver has been updated,
 807         replacing the bitmapped <literal>kern.vt.spclkeys</literal>
 808         &man.sysctl.8; with individual
 809         <literal>kern.vt.kbd_*</literal> variants.</para>
 810
 811       <para revision="273598">The &man.hpet.4; driver has been updated
 812         to create a
 813         <filename>/dev/hpet<replaceable>N</replaceable></filename>
 814         device, providing access to <acronym>HPET</acronym> from
 815         userspace.</para>
 816
 817       <para revision="280183">The <literal>drm</literal> code has
 818         been updated to match &linux; version 3.8.13.</para>
 819
 820       <para revision="282783" arch="powerpc">Support for the Freescale
 821         <acronym>PCI</acronym> Root Complex device has been
 822         added.</para>
 823     </sect2>
 824
 825     <sect2 xml:id="drivers-storage">
 826       <title>Storage Drivers</title>
 827
 828       <para revision="265236" contrib="sponsor"
 829         sponsor="&lsi;, &spectralogic;" sponsorurl="">The &man.mpr.4;
 830         device has been added, providing support for LSI Fusion-MPT
 831         3 12Gb SCSI/SATA controllers.</para>
 832
 833       <para revision="265555" contrib="sponsor"
 834           sponsor="&lsi;">The &man.mrsas.4; driver has been added,
 835         providing support for LSI MegaRAID SAS controllers.  The
 836         &man.mfi.4; driver will attach to the controller, by default.
 837         To enable &man.mrsas.4; add
 838         <literal>hw.mfi.mrsas_enable=1</literal> to
 839         <filename>/boot/loader.conf</filename>, which turns off
 840         &man.mfi.4; device probing.</para>
 841
 842       <note>
 843         <para>At this time, the &man.mfiutil.8; utility and the &os;
 844           version of <application>MegaCLI</application> and
 845           <application>StorCli</application> do not work with
 846           &man.mrsas.4;.</para>
 847       </note>
 848
 849       <para revision="275461" contrib="sponsor" sponsor="&ix;">The
 850         &man.ctl.4; subsystem has been updated, increasing the ports
 851         limit from <literal>128</literal> to <literal>256</literal>,
 852         and <acronym>LUN</acronym> limit from <literal>256</literal>
 853         to <literal>1024</literal>.</para>
 854
 855       <para revision="276526">The <literal>asr(4)</literal> driver has
 856         been removed, and is no longer supported.</para>
 857
 858       <para revision="281387">The &man.hptnr.4; driver has been
 859         updated to version 1.1.1.</para>
 860     </sect2>
 861
 862     <sect2 xml:id="drivers-network">
 863       <title>Network Drivers</title>
 864
 865       <para revision="258830">Support for Broadcom chipsets BCM57764,
 866         BCM57767, BCM57782, BCM57786 and BCM57787 has been added to
 867         &man.bge.4;.</para>
 868
 869       <para revision="260448">Support for the &intel; Centrino&trade;
 870         Wireless-N 135 chipset has been added.</para>
 871
 872       <para revision="260552">Firmware for &intel; Centrino&trade;
 873         Wireless-N 105 devices has been added to the base
 874         system.</para>
 875
 876       <para revision="261975">The deprecated nve(4) driver has been
 877         removed.  Users of NVIDIA nForce MCP network adapters are
 878         advised to use the &man.nfe.4; driver instead, which has been
 879         the default driver for this hardware since
 880         &os;&nbsp;7.0.</para>
 881
 882       <para revision="264601" contrib="sponsor"
 883         sponsor="&darpa_afrl;">The <literal>if_nf10bmac(4)</literal>
 884         device has been added, providing support for NetFPGA-10G
 885         Embedded CPU Ethernet Core.</para>
 886
 887       <note>
 888         <para>The <literal>if_nf10bmac(4)</literal> driver operates on
 889           the FPGA, and is not suited for the PCI host
 890           interface.</para>
 891       </note>
 892
 893       <para revision="265348" contrib="sponsor"
 894         sponsor="&netgate;">The &man.ath.hal.4; driver has been
 895         updated to support the Atheros AR1111 chipset.</para>
 896
 897       <para revision="266770">Support for the &intel; Centrino&trade;
 898         Wireless-N 105 chipset has been added.</para>
 899
 900       <para revision="266757" contrib="sponsor"
 901         sponsor="&chelsio;">Support for the &man.cxgbe.4; Terminator
 902         5 (T5) 10G/40G cards has been added to &man.netmap.4;.</para>
 903
 904       <para revision="272730">The &man.alc.4; driver has been updated
 905         to support AR816x and AR817x ethernet controllers.</para>
 906
 907       <para revision="273331">The &man.vxlan.4; driver has been added,
 908         which creates a virtual Layer 2 (Ethernet) network overlaid in
 909         a Layer 3 (IP/UDP) network.  The &man.vxlan.4; driver is
 910         analogous to &man.vlan.4;, but is designed to be better suited
 911         for large, multiple-tenant datacenter environments.</para>
 912
 913       <para revision="274246" contrib="sponsor" sponsor="&yandex;">The
 914         &man.gre.4; driver has been significantly overhauled, and has
 915         been split into two separate modules, &man.gre.4; and
 916         &man.me.4;.</para>
 917
 918       <para revision="283766" contrib="sponsor"
 919         sponsor="&limelight;">The &man.em.4; driver has been updated
 920         with improved transmission queue hang detection.</para>
 921     </sect2>
 922   </sect1>
 923
 924   <sect1 xml:id="hardware">
 925     <title>Hardware Support</title>
 926
 927     <para>This section covers general hardware support for physical
 928       machines, hypervisors, and virtualization environments, as well
 929       as hardware changes and updates that do not otherwise fit in
 930       other sections of this document.</para>
 931
 932     <sect2 xml:id="hardware-support">
 933       <title>Hardware Support</title>
 934
 935       <para revision="268303">The &man.asmc.4; driver has been
 936         updated to support the &apple;&nbsp;MacMini 3,1.</para>
 937
 938       <para revision="268351">Support for &os;/ia64 has been dropped
 939         as of &os;&nbsp;11.</para>
 940
 941       <para revision="274386">An issue that could cause a system to
 942         hang when entering <acronym>ACPI</acronym>
 943         <literal>S3</literal> state (suspend to
 944         <acronym>RAM</acronym>) has been corrected in the &man.acpi.4;
 945         and &man.pci.4; drivers.</para>
 946
 947       <para revision="274733" arch="powerpc">The power management unit
 948         subsystem has been updated to support power button events on
 949         certain &arch.powerpc; hardware, such as aluminum
 950         PowerBook&nbsp;&reg;.</para>
 951
 952       <para revision="275171,275190" arch="powerpc">The &man.hwpmc.4;
 953         driver has been updated to correct performance counter
 954         sampling on G4 (MPC74xxx) and G5 class processors.</para>
 955
 956       <para revision="281713" arch="powerpc">The &man.hwpmc.4;
 957         driver has been updated to support the Freescale e500
 958         core.</para>
 959
 960       <para revision="275732" contrib="sponsor"
 961         sponsor="&ff;,&netgate;">The
 962         <application>OpenCrypto</application> framework has been
 963         updated to include <literal>AES-ICM</literal> and
 964         <literal>AES-GCM</literal> modes, both of which have also been
 965         added to the &man.aesni.4; driver.</para>
 966
 967       <para revision="283766">The &man.ig4.4; driver has been added,
 968         providing support for the fourth generation &intel;
 969         <acronym>I2C</acronym> SMBus.</para>
 970     </sect2>
 971
 972     <sect2 xml:id="hardware-virtualization">
 973       <title>Virtualization Support</title>
 974
 975       <para revision="260410">Support for the <quote>Virtual Interrupt
 976           Delivery</quote> feature of &intel;&nbsp;VT-x is enabled if
 977         supported by the CPU.  This feature can be disabled by running
 978         <literal>sysctl hw.vmm.vmx.use_apic_vid=0</literal>.
 979         Additionally, to persist this setting across reboots, add
 980         <literal>hw.vmm.vmx.use_apic_vid=0</literal> to
 981         <filename>/etc/sysctl.conf</filename>.</para>
 982
 983       <para revision="260532">Support for <quote>Posted Interrupt
 984           Processing</quote> is enabled if supported by the CPU.  This
 985         feature can be disabled by running <literal>sysctl
 986           hw.vmm.vmx.use_apic_pir=0</literal>.  Additionally, to
 987         persist this setting across reboots, add
 988         <literal>hw.vmm.vmx.use_apic_pir=0</literal> to
 989         <filename>/etc/sysctl.conf</filename>.</para>
 990
 991       <para revision="260582">Unmapped IO support has been added to
 992         &man.virtio_blk.4;.</para>
 993
 994       <para revision="260583">Unmapped IO support has been added to
 995         &man.virtio_scsi.4;.</para>
 996
 997       <para revision="260847">The &man.virtio_random.4; driver has
 998         been added to harvest entropy from the host system.</para>
 999
1000       <para revision="261504">&os;/&arch.i386; guests can be run under
1001         bhyve.</para>
1002
1003       <para revision="267536" contrib="sponsor"
1004         sponsor="&citrix.rd;">Support for running a &os;/&arch.amd64;
1005         <application>Xen</application> guest instance as
1006         <acronym>PVH</acronym> guest has been added.
1007         <acronym>PVH</acronym> mode, short for <quote>Para-Virtualized
1008           Hardware</quote>, uses para-virtualized drivers for boot and
1009         I/O, and uses hardware virtualization extensions for all other
1010         tasks, without the need for emulation.</para>
1011
1012       <para revision="273515">The &man.virtio.console.4; driver has
1013         been added, which provides an interface to VirtIO console
1014         devices through a &man.tty.4; device.</para>
1015
1016       <para revision="279957">The &man.bhyve.8; hypervisor has been
1017         updated to support <literal>DSM TRIM</literal> commands for
1018         virtual <acronym>AHCI</acronym> disks.</para>
1019
1020       <para revision="281439" arch="arm">Support for the
1021         <application>QEMU</application> <literal>virt</literal> system
1022         has been added.</para>
1023
1024       <para revision="282212" contrib="sponsor" sponsor="&msostc;">The
1025         HyperV&trade; drivers have been updated with several
1026         enhancements:</para>
1027
1028       <itemizedlist>
1029         <listitem>
1030           <para>The &man.hv.vmbus.4; driver now has multi-channel
1031             support.</para>
1032         </listitem>
1033
1034         <listitem>
1035           <para>The &man.hv.storvsc.4; driver now has scatter/gather
1036             support, in addition to performance improvements.</para>
1037         </listitem>
1038
1039         <listitem>
1040           <para>The &man.hv.kvp.4; driver has received several bug
1041             fixes.</para>
1042         </listitem>
1043       </itemizedlist>
1044
1045       <para revision="282274">Support for &man.xen.4; para-virtualized
1046         <literal>domU</literal> kernels has been removed.</para>
1047     </sect2>
1048
1049     <sect2 xml:id="hardware-arm">
1050       <title>ARM Support</title>
1051
1052       <para revision="260921">The &man.nand.4; device is enabled for
1053         ARM devices by default.</para>
1054
1055       <para revision="273264" arch="armv6">An issue that could cause
1056         instability when detecting <acronym>SD</acronym> cards on the
1057         Raspberry Pi <acronym>SOC</acronym> has been fixed.</para>
1058
1059       <para revision="275963">The <literal>bcm2835_cpufreq</literal>
1060         driver has been added, which supports <acronym>CPU</acronym>
1061         frequency and voltage control on the Raspberry Pi
1062         <acronym>SOC</acronym>.</para>
1063
1064       <para revision="280259" contrib="sponsor" sponsor="&ff;">Initial
1065         support for the ARM AArch64 architecture has been
1066         added.</para>
1067
1068       <para revision="282779" arch="arm">Kernel support for Thumb-2
1069         has been added.</para>
1070
1071       <para revision="282827">Support for the hardware power button
1072         on the BeagleBone Black system has been added.</para>
1073
1074       <para revision="284273" contrib="sponsor"
1075         sponsor="&ff;">Initial
1076         <acronym>ACPI</acronym> support has been added for
1077         &os;/&arch.arm64;.</para>
1078     </sect2>
1079   </sect1>
1080
1081   <sect1 xml:id="storage">
1082     <title>Storage</title>
1083
1084     <para>This section covers changes and additions to file systems
1085       and other storage subsystems, both local and networked.</para>
1086
1087     <sect2 xml:id="storage-general">
1088       <title>General Storage</title>
1089
1090       <para revision="278037" contrib="sponsor" sponsor="&ix;">The
1091         &man.ctl.4; <acronym>LUN</acronym> mapping has been rewritten,
1092         replacing <acronym>iSCSI</acronym>-specific mapping mechanisms
1093         with a new mechanism that works for any port.</para>
1094
1095       <para revision="278354" contrib="sponsor" sponsor="&ix;">The
1096         &man.ctld.8; utility has been updated to allow controlling
1097         non-<acronym>iSCSI</acronym> &man.ctl.4; ports.</para>
1098     </sect2>
1099
1100     <sect2 xml:id="storage-net">
1101       <title>Networked Storage</title>
1102
1103       <para revision="270096" contrib="sponsor" sponsor="&ff;">The new
1104         filesystem automount facility, &man.autofs.5;, has been added.
1105         The new &man.autofs.5; facility is similar to that found in
1106         other &unix;-like operating systems, such as OS&nbsp;X&trade;
1107         and Solaris&trade;.  The &man.autofs.5; facility uses
1108         a &sun;-compatible &man.auto.master.5; configuration file, and
1109         is administered with the &man.automount.8; userland utility,
1110         and the &man.automountd.8; and &man.autounmountd.8;
1111         daemons.</para>
1112     </sect2>
1113
1114     <sect2 xml:id="storage-zfs">
1115       <title>ZFS</title>
1116
1117       <para revision="275748">The <literal>arc_meta_limit</literal>
1118         statistics are now visible through the
1119         <literal>kstat</literal> &man.sysctl.8;.  As a result of this
1120         change, the <literal>vfs.zfs.arc_meta_used</literal>
1121         &man.sysctl.8; has been removed, and replaced with the
1122         <literal>kstat.zfs.misc.arcstats.arc_meta_used</literal>
1123         &man.sysctl.8;.</para>
1124     </sect2>
1125
1126     <sect2 xml:id="storage-geom">
1127       <title>&man.geom.4;</title>
1128
1129       <para revision="267359">Support for the
1130         <literal>disklabel64</literal> partitioning scheme has been
1131         added to &man.gpart.8;.</para>
1132     </sect2>
1133   </sect1>
1134
1135   <sect1 xml:id="boot">
1136     <title>Boot Loader Changes</title>
1137
1138     <para>This section covers the boot loader, boot menu, and other
1139       boot-related changes.</para>
1140
1141     <sect2 xml:id="boot-loader">
1142       <title>Boot Loader Changes</title>
1143
1144       <para revision="274085">The &man.vt.4; driver has been made the
1145         default system console driver.  The &man.syscons.4; driver is
1146         still available, and can be enabled by adding
1147         <literal>kern.vty=sc</literal> in &man.loader.conf.5;.
1148         Alternatively, &man.syscons.4; can be enabled at boot time by
1149         entering <literal>set kern.vty=sc</literal> at the
1150         &man.loader.8; prompt.</para>
1151
1152       <para revision="281616">The boot loader has been updated to
1153         support entering the <acronym>GELI</acronym> passphrase before
1154         loading the kernel.  To enable this behavior, add
1155         <literal>geom_eli_passphrase_prompt="YES"</literal> to
1156         &man.loader.conf.5;.</para>
1157     </sect2>
1158
1159     <sect2 xml:id="boot-menu">
1160       <title>Boot Menu Changes</title>
1161
1162       <para>&nbsp;</para>
1163     </sect2>
1164   </sect1>
1165
1166   <sect1 xml:id="network">
1167     <title>Networking</title>
1168
1169     <para>This section describes changes that affect networking in
1170       &os;.</para>
1171
1172     <sect2 xml:id="network-protocols">
1173       <title>Network Procols</title>
1174
1175       <para revision="263140">Support for the IPX network transport
1176         protocol has been removed, and will not be supported in
1177         &os;&nbsp;11 and later releases.</para>
1178
1179       <para revision="272720" contrib="sponsor"
1180         sponsor="&limelight;">Support for <acronym>PLPMTUD</acronym>
1181         blackhole detection (<acronym>RFC</acronym> 4821) has been
1182         added to the &man.tcp.4; stack, disabled by default.  New
1183         control tunables have been added:</para>
1184
1185       <informaltable frame="none" pgwide="0">
1186         <tgroup cols="2">
1187           <colspec colwidth="1*"/>
1188           <colspec colwidth="1*"/>
1189           <thead>
1190             <row>
1191               <entry>Tunable</entry>
1192               <entry>Description</entry>
1193             </row>
1194           </thead>
1195
1196           <tbody>
1197             <row>
1198               <entry><literal>net.inet.tcp.pmtud_blackhole_detection</literal></entry>
1199               <entry>Enables or disables <acronym>PLPMTUD</acronym>
1200                 blackhole detection</entry>
1201             </row>
1202
1203             <row>
1204               <entry><literal>net.inet.tcp.pmtud_blackhole_mss</literal></entry>
1205               <entry><acronym>MSS</acronym> to try for IPv4</entry>
1206             </row>
1207
1208             <row>
1209               <entry><literal>net.inet.tcp.v6pmtud_blackhole_mss</literal></entry>
1210               <entry><acronym>MSS to try for IPv6</acronym></entry>
1211             </row>
1212           </tbody>
1213         </tgroup>
1214       </informaltable>
1215
1216       <para>New monitoring &man.sysctl.8;s haven been added:</para>
1217
1218       <informaltable frame="none" pgwide="0">
1219         <tgroup cols="2">
1220           <colspec colwidth="1*"/>
1221           <colspec colwidth="1*"/>
1222           <thead>
1223             <row>
1224               <entry>Tunable</entry>
1225               <entry>Description</entry>
1226             </row>
1227           </thead>
1228
1229           <tbody>
1230             <row>
1231               <entry><literal>net.inet.tcp.pmtud_blackhole_activated</literal></entry>
1232               <entry>Number of times the code was activated to attempt
1233                 downshifting the <acronym>MSS</acronym></entry>
1234             </row>
1235
1236             <row>
1237               <entry><literal>net.inet.tcp.pmtud_blackhole_min_activated</literal></entry>
1238               <entry>Number of times the blackhole
1239                 <acronym>MSS</acronym> was used in an attempt to
1240                 downshift</entry>
1241             </row>
1242
1243             <row>
1244               <entry><literal>net.inet.tcp.pmtud_blackhole_failed</literal></entry>
1245               <entry>Number of times that the blackhole failed to
1246                 connect after downshifting the
1247                 <acronym>MSS</acronym></entry>
1248             </row>
1249           </tbody>
1250         </tgroup>
1251       </informaltable>
1252
1253       <para revision="280971" contrib="sponsor"
1254         sponsor="&netflix;, &nginx;">Support for <acronym>IP</acronym>
1255         identification for atomic datagrams (<acronym>RFC</acronym>
1256         6864) has been added.  Support for this feature can be toggled
1257         with the <literal>net.inet.ip.rfc6864</literal>
1258         &man.sysctl.8;, which is enabled by default.</para>
1259     </sect2>
1260   </sect1>
1261
1262   <sect1 xml:id="ports">
1263     <title>Ports Collection and Package Infrastructure</title>
1264
1265     <para>This section covers changes to the &os;&nbsp;Ports
1266       Collection, package infrastructure, and package maintenance and
1267       installation tools.</para>
1268
1269     <sect2 xml:id="ports-infrastructure">
1270       <title>Infrastructure Changes</title>
1271
1272       <para>&nbsp;</para>
1273     </sect2>
1274
1275     <sect2 xml:id="ports-packages ">
1276       <title>Packaging Changes</title>
1277
1278       <para>&nbsp;</para>
1279     </sect2>
1280   </sect1>
1281
1282   <sect1 xml:id="doc">
1283     <title>Documentation</title>
1284
1285     <para>This section covers changes to the &os;&nbsp;Documentation
1286       Project sources and toolchain.</para>
1287
1288     <sect2 xml:id="doc-sources">
1289       <title>Documentation Source Changes</title>
1290
1291       <para>&nbsp;</para>
1292     </sect2>
1293
1294     <sect2 xml:id="doc-toolchain">
1295       <title>Documentation Toolchain Changes</title>
1296
1297       <para>&nbsp;</para>
1298     </sect2>
1299   </sect1>
1300
1301   <sect1 xml:id="releng">
1302     <title>Release Engineering and Integration</title>
1303
1304     <para>This section convers changes that are specific to the
1305       &os;&nbsp;Release Engineering processes.</para>
1306
1307     <sect2 xml:id="releng-changes">
1308       <title>Integration Changes</title>
1309
1310       <para revision="277458" contrib="sponsor" sponsor="&ff;">The
1311         Release Engineering build tools have been updated to include
1312         support for producing virtual machine disk images for various
1313         cloud hosting providers.</para>
1314
1315       <para revision="278926">The Release Engineering build tools have
1316         been updated to use multi-threaded &man.xz.1;.  By default,
1317         the number of &man.xz.1; threads is set to the number of cores
1318         available.</para>
1319
1320       <para revision="281802" contrib="sponsor" sponsor="&ff;">The
1321         Release Engineering build tools have been updated to include
1322         support for building &os;/&arch.arm64; virtual machine and
1323         memory stick installation images.</para>
1324     </sect2>
1325   </sect1>
1326 </article>