process stuck in nfsfsync state
Robert Watson
rwatson at freebsd.org
Sun Nov 7 12:47:58 PST 2004
On Sun, 7 Nov 2004, Joan Picanyol wrote:
> * Joan Picanyol <lists-freebsd-stable at biaix.org> [20041025 18:09]:
> > * Robert Watson <rwatson at freebsd.org> [20041025 14:24]:
> > > - It would be useful to see if less complicated NFS meta-transactions than
> > > "Start GTK" can trigger the problem. For example, doing a large dd to a
> > > file in NFS, varying the blocksize to see if you can find useful
> > > thresholds that trigger the problem. I see a lot of successful 512 byte
> > > writes in the trace, but larger datagram sizes of 8192 for writes seem
> > > to have problems.
> >
> > Now this is interesting:
> >
> > dd if=/dev/urandom of=/fs/bulk/mount/dummy bs=512 count=14
> >
> > wedges the NFS mount point 100% of the times. Lowering the count to 13
> > doesn't reproduce the hang.
>
> Oh well, I can't reproduce this any more after upgrading. Go figure...
If it comes back, please let me know. It sounds like it may have been a
device driver problem or switch problem. I suppose it would be
interesting to have you downgrade and see if it comes back, but that might
be a lot more interesting from my perspective than your perspective :-).
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org Principal Research Scientist, McAfee Research
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