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author | rmacklem <rmacklem@FreeBSD.org> | 2014-08-17 19:24:26 +0000 |
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committer | rmacklem <rmacklem@FreeBSD.org> | 2014-08-17 19:24:26 +0000 |
commit | cdfc4fb07a7bd7ba35eec600db8bef2521de33b2 (patch) | |
tree | ca206fc1121b9e32c4207cd19fc96964785718f6 | |
parent | e13575583f1eeb0dbfa5eb4e0d2f5d039a1d5913 (diff) | |
download | FreeBSD-src-cdfc4fb07a7bd7ba35eec600db8bef2521de33b2.zip FreeBSD-src-cdfc4fb07a7bd7ba35eec600db8bef2521de33b2.tar.gz |
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.
-rw-r--r-- | usr.sbin/nfsd/nfsd.8 | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/usr.sbin/nfsd/nfsd.8 b/usr.sbin/nfsd/nfsd.8 index d865d7e..660e5e8 100644 --- a/usr.sbin/nfsd/nfsd.8 +++ b/usr.sbin/nfsd/nfsd.8 @@ -28,7 +28,7 @@ .\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95 .\" $FreeBSD$ .\" -.Dd July 18, 2014 +.Dd August 10, 2014 .Dt NFSD 8 .Os .Sh NAME @@ -175,6 +175,24 @@ 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 |