From: Greg Banks <gnb@melbourne.sgi.com>
To: Erik Walthinsen <omega@pdxcolo.net>
Cc: Ian Kent <raven@themaw.net>, nfs@lists.sourceforge.net
Subject: Re: NAS server avalanche overload
Date: Thu, 04 Mar 2004 16:47:16 +1100 [thread overview]
Message-ID: <4046C2E4.C33EAEB5@melbourne.sgi.com> (raw)
In-Reply-To: 1078378313.853.3.camel@localhost
Erik Walthinsen wrote:
>
> On Wed, 2004-03-03 at 20:39, Ian Kent wrote:
> > Bumping the number of threads to 32 or 64 or more would be the first
> > thing I would try.
>
> Only problem is that if the spike occurs anyway, the load will be 33 or
> 65 instead of 17. I don't know if it's ctxswitching itself to death
> while all these nfsd's are blocking,
If it's the same as I've seen, an nfsd will be spinning in schedule()
trying to reacquire the BKL. Changing the number of nfsds is not
going to affect the amount of CPU wasted (i.e. pretty much all of
it) just the number of runnable processes.
Greg.
--
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.
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next prev parent reply other threads:[~2004-03-04 5:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-03 8:31 NAS server avalanche overload Erik Walthinsen
2004-03-03 22:02 ` Erik Walthinsen
2004-03-04 0:04 ` Greg Banks
2004-03-04 0:20 ` Erik Walthinsen
2004-03-04 1:40 ` Greg Banks
2004-03-04 2:17 ` Trond Myklebust
2004-03-04 4:39 ` Ian Kent
2004-03-04 5:31 ` Erik Walthinsen
2004-03-04 5:47 ` Greg Banks [this message]
2004-03-04 14:38 ` Ian Kent
[not found] <482A3FA0050D21419C269D13989C61130435DCCB@lavender-fe.eng.netapp.com>
2004-03-03 22:34 ` Erik Walthinsen
-- strict thread matches above, loose matches on Subject: below --
2004-03-04 2:07 Lever, Charles
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