Date: Sat, 30 Aug 2014 20:26:31 +0000 (UTC) From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r270860 - stable/9/usr.sbin/nfsd Message-ID: <201408302026.s7UKQVTE040228@svn.freebsd.org>
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Author: rmacklem Date: Sat Aug 30 20:26:30 2014 New Revision: 270860 URL: http://svnweb.freebsd.org/changeset/base/270860 Log: MFC: r269788 Document the use of the vfs.nfsd sysctls that control the size of the NFS server's DRC for TCP. This is a content change. Modified: stable/9/usr.sbin/nfsd/nfsd.8 Directory Properties: stable/9/usr.sbin/nfsd/ (props changed) Modified: stable/9/usr.sbin/nfsd/nfsd.8 ============================================================================== --- stable/9/usr.sbin/nfsd/nfsd.8 Sat Aug 30 20:18:47 2014 (r270859) +++ stable/9/usr.sbin/nfsd/nfsd.8 Sat Aug 30 20:26:30 2014 (r270860) @@ -28,7 +28,7 @@ .\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95 .\" $FreeBSD$ .\" -.Dd April 23, 2011 +.Dd August 10, 2014 .Dt NFSD 8 .Os .Sh NAME @@ -164,6 +164,24 @@ utility would then be used to block nfs-related packets that come in on the outside interface. .Pp +If the server has stopped servicing clients and has generated a console message +like +.Dq Li "nfsd server cache flooded..." , +the value for vfs.nfsd.tcphighwater needs to be increased. +This should allow the server to again handle requests without a reboot. +Also, you may want to consider decreasing the value for +vfs.nfsd.tcpcachetimeo to several minutes (in seconds) instead of 12 hours +when this occurs. +.Pp +Unfortunately making vfs.nfsd.tcphighwater too large can result in the mbuf +limit being reached, as indicated by a console message +like +.Dq Li "kern.ipc.nmbufs limit reached" . +If you cannot find values of the above +.Nm sysctl +values that work, you can disable the DRC cache for TCP by setting +vfs.nfsd.cachetcp to 0. +.Pp The .Nm utility has to be terminated with
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