On Wed, 9 Jun 2010 13:52:40 -0400 (EDT) r...@akira.stdio.com wrote: > I have an AMD64 FreeBSD 8.0 running 8-Stable from around 2010/04/25 19:13:08. > > ZFS disk, Nfsd flags "-t -n 16", private network exclusive for nfs network, > not using jumbo frames, HZ=1000, Device_Polling, Zero_Copy_Sockets, and the > following sysctl options: > net.inet.tcp.recvspace=232140 > net.inet.tcp.sendspace=232140 > net.inet.tcp.slowstart_flightsize=159 > net.inet.tcp.mssdflt=1460 > > FreeBSD 6 TB zpool, nfs from Three ESXi 4 (newest patch level 193498) > working reliably for months. > > Added a new ESXi, patched to the newest (Post Update 1) patch level 256968. > Added a bunch of VM's, booted them all into the 2008 R2 Server install DVD. > Then when attempting to do the installs (in parallel/simultaneously) I started > getting the NFS server locking up. NFSD would wedge at 100% CPU in "rc_lo" > which I presume is rc_lock? Once wedged, /etc/rc.d/nfsd restart can't kill > nfsd. So a reboot is required. A Reboot causes all my active VM's with > pending disk writes to have disk errors in the VM (10 second default timeout > for disk writes in the VM.) This was very reproducable. > > Has anyone noticed this problem? Is this an ESXi problem with the newest > updates? Is this a problem with NFS on FreeBSD 8?
I don't know if it's relevant, but I've been having nfs issues on -current. I believe they were caused by gam_server, a gnome program running on an NFS client machine that had /usr/ports nfs mounted and was doing a portupgrade. Nothing gnomeish should have been anywhere near /usr/ports, but analysis showed huge numbers of NFS stats against /usr/ports/distfiles/*, restat'ing the same files over and over. nfsd was going crazy on the server and gam_server was clocking up wads of CPU time on the client. FreeBSD-9 kernels prior to around June 6 were freezing on me. It may have been because of the nfsd activity, but I didn't investigate the freeze... Perhaps looking for changes that might might affect nfsd stability in the week prior to June 6 might discover a fix? -- Brian Somers <br...@awfulhak.org> Don't _EVER_ lose your sense of humour ! <br...@freebsd.org>
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