Re: 2.4.18 knfsd load spikes

[Jeff Smith <jeff@atheros.com>]

It is exactly as you describe.  Before this started happening, I would run 16
nfsd threads.  And when it started happening the load would creep up to 16 as
the server grinds to a halt.  To mitigate this, I've dropped down to 2 nfsd
threads so that the machine does not die before I can locate and kill the
"offending" job.

Jeff

Eric Whiting wrote:
> 
> I see the load spikes as well. A ps shows the nfsd processes in the 'DW'
> state. DW isn't bad, but when it sits there a long time then the load
> jumps up. (could be disk or network related I think?) This seems similar
> to what you describe here. Does the load average ramp up to the number
> of nfsd threads?
> 
> eric
> 
> Jeff Smith wrote:
> >
> > We are running ext2 filesystems on a Supermicro dual P3 with Serverworks HE
> > chipset.  As best I can tell (which probably does not count for much), the CPU
> > load comes from all the nfsd's holding off requests while waiting for a cache
> > flush.  It happens whenever a particular job is run which slowly reads and
> > extends a very large file.  When we suspend the job, every thing returns to
> > normal.  When we resume the job, everything continues to run normally for a
> > while, but soon begins to bog down the fileserver again.
> >
> > Anyway, I hope you are right that you are experiencing a different problem.
> > Scheduling downtime around here is difficult, but hopefully in the next few
> > weeks I will be able to upgrade the fileservers to 2.4.18 (or 2.4.19?).  In the
> > mean time, I'm trying to build a test machine to replicate the problem (and,
> > hopefully, verify the fix).
> >

-- 
Jeff Smith                                  Atheros Communications, Inc.
Hardware Manager                            529 Almanor Avenue
(408) 773-5257                              Sunnyvale, CA  94086

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