Add a paragraph about the DT_GNU_HASH feature
[ikiwiki.git] / release32 / index.mdwn
da4e7f03 1# DragonFly Release 3.2
3## 22 October 2012 (3.2.1 release)
6The DragonFly 3.0 release is here!
8## Big-ticket items
10### foo
d7de0cab 12
da4e7f03 13bar bar bar
16## Availability
18Four release options are now available for 32-bit as well as for 64-bit. 64-bit installations are recommended if you do not need the linux emulation layer.
20* An ISO, to be burned to a physical CD or used as an image to install a virtual machine.
21* A bootable USB disk-key image. (minimum 2G USB stick needed)
22* A GUI bootable ISO image with a full X environment. DVD disc required.
23* A GUI bootable USB disk-key image with a full X environment. (minimum 4G USB stick needed)
24* The GUI images also include a snapshot of our git repos in /usr/src/.git and /usr/pkgsrc/.git which can be incrementally updated after the installation.
26The release ISO images should be available on most of the [[mirrors|mirrors]]. If the ISO is not available on a certain mirror, please try another one or download it from the DragonFly master site. Each image is in the "Live CD" format, meaning that it boots into a running and fully functional DragonFly system, which can be used for testing or system recovery tasks as well as installation. Check the [hardware page]( or boot a Live CD to check for compatibility.
28The GUI bootable USB image also contains the DragonFly git repo in /usr/src and the pkgsrc git repo in /usr/pkgsrc. The code can be trivially checked out using these repos and can be incrementally updated from master sites, post-install.
30### MD5 sums
32MD5 sums for the compressed images:
34* MD5 (dfly-i386-3.0.1_REL.img.bz2) = 8f812dbcb9c0ca28a61f5a0ae1e35a9e
38MD5 sums for the uncompressed images:
40* MD5 (dfly-i386-3.0.1_REL.img) = a7cc87b26c04a179476f9c3f20f8ce9d
45### pkgsrc packages
47We offer roughly 10,000 pre-built [pkgsrc]( packages for this release. The [pkg_radd(1)]( utility may be used to download pre-built binary packages. The path can be overridden by setting BINPKG_BASE in `/etc/pkg_radd.conf`.
49To get a list of all packages, let [pkg_search(1)]( download the summary file for that release:
51 # pkg_search -d
53We supply a Makefile in `/usr` to track the pkgsrc tree and we supply a Git mirror of the NetBSD pkgsrc CVS repo at `git://`. We recommend that users use it, instead of pulling from NetBSD with CVS. Our Git mirror is updated several times a day. Type 'make' in /usr to see the available commands for performing these actions.
55## DragonFly 3.0 Special Installation and Upgrade Notes
57**Disk size warning** - Unless your hard disk is 50G or larger, we recommend doing a UFS install and not the default HAMMER install. We also recommend installing from the CD ISO, not the GUI .img, for smaller drives. A more serious installation should use HAMMER with at least 50G of disk space and can install from the GUI .img. HAMMER on smaller disk drives is possible but requires careful pruning to keep from filling the disk with file history.
59**Virtual PC users** - Virtual PC does not supply serial numbers for the virtual disks. The system may need to be manually directed in the boot loader if the disk identifier changes. (Hit ? in the boot loader for a list of available volumes.)
61**Qemu users** - If you see a large number of error messages on the console when booting, you may need to boot DragonFly with ACPI disabled. This can be done in the menu presented at initial boot. If that doesn't help, try placing hw.ioapic_enable=0 in /boot/loader.conf.
63**Installer Crypt Options** - The installer can encrypt the root volume and the swap volume. It will not work properly for other volumes despite any additional check-boxes you might see. Installer and boot-time support works but is still a bit rough around the edges. Performance will be relatively high on multi-core machines.
65**Remaining issues** -
68## DragonFly 3.2.1 Release Notes
70> ### Kernel changes
33410790 72* Many bug fixes, greatly improving stability. More robust pcb_onfault handling, fixed issues in the namecache module, VM system, etc.
74* Removed several arbitrary bounds on kernel caches (such as the buffer cache) for x86-64.
76* Improved control over BREAK_TO_DEBUGGER by adding run-time sysctls.
78* Removed sio console baud switching when console & getty/login is running on the same serial port.
80* mmap() now segment-aligns mappings when reasonable to do so.
82* KTR logging is now frozen on entry to panic.
da4e7f03 83
96930242 84* Removed size cap for tmpfs. This created problems when mounting tmpfs partitions from fstab prior to swap being turned on.
86* Numerous buffer cache clustering performance improvements.
88* Numerous vkernel related fixes.
a4c07330 90* Implicit 64KB I/O request size limitations have been removed. All block devices can now cluster I/O requests up to MAXPHYS (128KB) if they support it.
92* A new filesystem-independent quota subsystem has been added. See vquota(8)
94> ### Hardware changes
96* Watchdog drivers for Intel and AMD chipsets have been imported from FreeBSD. See ichwd(4) and amdsbwd(4).
98* A ixgbe(4) driver for Intel 10Gb/s ethernet adapters has been added.
da4e7f03 99
100> ### New Multiprocessor-safe Work
81b597c4 101
102* Introduced a new cpu topology aware scheduler, usched_dfly, and made it the default. This scheduler implements several weighted algorithms and will first try to schedule threads to different sockets (to make best use of on-chip caches). As the load increases threads are then scheduled to real cores, and finally will be scheduled to hyper-threads. Threads with similar load characteristics tend to get spread out more. The scheduler also implements wait/wakeup pairing detection and tries to move related threads closer together to reduce inter-socket cache coherency bandwidth and share L3 caches.
104* Greatly reduced SMP bottlenecks in the unix domain socket code.
106* Implemented shared tokens to reduce unnecessary bottlenecks in the VM system, particularly for forked and threaded processes.
108* Introduced a major pmap optimization for x86-64 which allows page table pages to be shared between UNRELATED processes (so it works for process's separately exec'd or forked), in situations where those processes are mmap()ing the same thing. This feature works extremely well for both sysv shared memory and mmap()-based shared memory. In tests with postgres and a 6GB shared memory block the prior memory consumption from forking is now gone. This page table sharing works even better than the original shm_use_phys sysctl. Also observed significantly faster X application startup.
33410790 109
110* Removed bottlenecks from the SYSV semaphore module and fixed numerous timing races.
112* Added ability to bypass hardware timer read for gettimeofday(), added additional CLOCK_* defines for clock_gettime() and friends.
da4e7f03 114> ### Userland changes
33410790 115
116* mount now sniffs the label for hints on what type of filesystem is being mounted, when not otherwise specified. UFS is only assumed if no information can be garnered from the sniffing.
ecfe9d07 118* Added support for DT_GNU_HASH elf sections.
119Essentially DT_GNU_HASH is a GNU extension to the ELF
120format that allows symbol searches much faster than the System V ABI
121standard hash does.
122For very large programs written in languages such as c++ that tend to link in many libraries with many symbols, the reduction in start-time can be dramatic.
da4e7f03 123
124> ### Removals
127> ### Contributed Software
128* Shipping with pkgsrc-2012Q3 built packages.
129* foo removed
130* foo replaced with bar
131* foor updated to foo2.1
133>### Security related