From: Matthew Dillon <dillon@dragonflybsd.org>
Date: Thu, 17 Mar 2005 22:25:46 +0000 (+0000)
Subject: Add RCNG support for setting the negative attribute cache timeout, make
X-Git-Tag: v2.0.1~8129
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/d615ff4f4eec594a1e0dc2ceaffafbbd1c4551db

Add RCNG support for setting the negative attribute cache timeout, make
the boot-time display of nfs client parameters more readable, and properly
document the nfs_access_cache and nfs_neg_cache RCNG configuration variables.

Increase the default NFS attribute cache timeout from 2 to 5 seconds.
---

diff --git a/etc/defaults/rc.conf b/etc/defaults/rc.conf
index 58cf8e9e38..77a0d65e6d 100644
--- a/etc/defaults/rc.conf
+++ b/etc/defaults/rc.conf
@@ -14,7 +14,7 @@
 # All arguments must be in double or single quotes.
 #
 # $FreeBSD: src/etc/defaults/rc.conf,v 1.180 2003/06/26 09:50:50 smkelly Exp $
-# $DragonFly: src/etc/defaults/rc.conf,v 1.21 2005/02/17 22:35:38 liamfoy Exp $
+# $DragonFly: src/etc/defaults/rc.conf,v 1.22 2005/03/17 22:25:44 dillon Exp $
 
 ##############################################################
 ###  Important initial Boot-time options  ####################
@@ -185,12 +185,17 @@ sshd_flags=""			# Additional flags for sshd.
 
 ### Network File System (NFS): ###
 ### Server-side options also need rpcbind_enable="YES" ###
+###
+### NOTE: attribute cache timeouts only effect NFS lookup rpc's.  If
+### the mtime matches the data cache is left intact.
+###
 amd_enable="NO"			# Run amd service with $amd_flags (or NO).
 amd_flags="-a /.amd_mnt -l syslog /host /etc/amd.map /net /etc/amd.map"
 amd_map_program="NO"		# Can be set to "ypcat -k amd.master"
 nfs_client_enable="NO"		# This host is an NFS client (or NO).
 nfs_client_flags="-n 4"		# Flags to nfsiod (if enabled).
-nfs_access_cache="2"		# Client cache timeout in seconds
+nfs_access_cache="5"		# Client attribute cache timeout in seconds
+#nfs_neg_cache="3"		# Client attribute negative hit cache timeout
 nfs_server_enable="NO"		# This host is an NFS server (or NO).
 nfs_server_flags="-u -t -n 4"	# Flags to nfsd (if enabled).
 mountd_enable="NO"		# Run mountd (or NO).
diff --git a/etc/rc.d/nfsclient b/etc/rc.d/nfsclient
index b30ca7f6ba..08ddce87bd 100644
--- a/etc/rc.d/nfsclient
+++ b/etc/rc.d/nfsclient
@@ -1,7 +1,7 @@
 #!/bin/sh
 #
 # $FreeBSD: src/etc/rc.d/nfsclient,v 1.3 2002/10/12 10:31:31 schweikh Exp $
-# $DragonFly: src/etc/rc.d/nfsclient,v 1.4 2004/01/27 00:42:45 rob Exp $
+# $DragonFly: src/etc/rc.d/nfsclient,v 1.5 2005/03/17 22:25:15 dillon Exp $
 #
 
 # PROVIDE: nfsclient
@@ -33,19 +33,24 @@ nfsclient_start()
 	#
 	# Run nfsiod and set some nfs client related sysctls
 	#
+	echo -n "NFS CLIENT:"
 	if [ -n "${nfs_client_flags}" ]; then
 		echo -n ' nfsiod'
 		nfsiod ${nfs_client_flags}
 	fi
 
 	if [ -n "${nfs_access_cache}" ]; then
-		echo "NFS access cache time=${nfs_access_cache}"
 		sysctl vfs.nfs.access_cache_timeout=${nfs_access_cache} >/dev/null
 	fi
+	if [ -n "${nfs_neg_cache}" ]; then
+		sysctl vfs.nfs.neg_cache_timeout=${nfs_neg_cache} >/dev/null
+	fi
 	if [ -n "${nfs_bufpackets}" ]; then
-		 sysctl vfs.nfs.bufpackets=${nfs_bufpackets} > /dev/null
+		sysctl vfs.nfs.bufpackets=${nfs_bufpackets} > /dev/null
 	fi
-
+	echo -n " access_cache_timeout=`sysctl -n vfs.nfs.access_cache_timeout`"
+	echo -n " neg_cache_timeout=`sysctl -n vfs.nfs.neg_cache_timeout`"
+	echo ""
 	unmount_all
 }
 
diff --git a/share/man/man5/rc.conf.5 b/share/man/man5/rc.conf.5
index 058a84e7b4..e337f2c852 100644
--- a/share/man/man5/rc.conf.5
+++ b/share/man/man5/rc.conf.5
@@ -23,7 +23,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\" $FreeBSD: src/share/man/man5/rc.conf.5,v 1.197 2003/07/28 13:56:00 mbr Exp $
-.\" $DragonFly: src/share/man/man5/rc.conf.5,v 1.9 2005/02/17 22:44:39 liamfoy Exp $
+.\" $DragonFly: src/share/man/man5/rc.conf.5,v 1.10 2005/03/17 22:25:46 dillon Exp $
 .Dd March 3, 2002
 .Dt RC.CONF 5
 .Os
@@ -1169,8 +1169,27 @@ this can be set to
 to disable NFS ACCESS RPC caching, or to the number of seconds for which
 NFS ACCESS
 results should be cached.
+A value of 2-10 seconds will substantially reduce network traffic for
+many NFS operations.  The default is 5 seconds.  Note that the attribute
+cache holds stat information only.  The NFS data cache is independant
+of the attribute cache and is only invalidated when the client detects that
+the server has modified the underlying file.  This value specifies a
+maximum timeout.  The NFS client will automatically use a shorter timeout
+for files which have been recently modified.
+.It Va nfs_neg_cache
+.Pq Vt int
+If
+.Va nfs_client_enable
+is set to
+.Dq Li YES ,
+this can be set to
+.Dq Li 0
+to disable the caching of NEGATIVE LOOKUPS (lookups of non-existant 
+filenames), or to the number of seconds for which negative lookups should
+be cached.
 A value of 2-10 seconds will substantially reduce network
-traffic for many NFS operations.
+traffic for many NFS operations, especially source code builds.  The
+default is 3 seconds.
 .It Va nfs_server_enable
 .Pq Vt bool
 If set to