Date: Wed, 02 Nov 2005 15:37:29 +0000 From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> To: ticso@cicely.de Cc: freebsd-current@freebsd.org, rwatson@freebsd.org Subject: Re: Poor NFS server performance in 6.0 with SMP and mpsafenet=1 Message-ID: <1130945849.51544.42.camel@buffy.york.ac.uk> In-Reply-To: <20051102152322.GF93549@cicely12.cicely.de> References: <1130943516.51544.34.camel@buffy.york.ac.uk> <20051102152322.GF93549@cicely12.cicely.de>
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On Wed, 2005-11-02 at 16:23 +0100, Bernd Walter wrote: > On Wed, Nov 02, 2005 at 02:58:36PM +0000, Gavin Atkinson wrote: > > I'm seeing incredibly poor performance when serving files from an SMP > > FreeBSD 6.0RC1 server to a Solaris 10 client. I've done some > > experimenting and have discovered that either removing SMP from the > > kernel, or setting debug.mpsafenet=0 in loader.conf massively improves > > the speed. Switching preemption off seems to also help. > > > > No SMP, mpsafenet=1 59.4 > > No SMP, mpsafenet=0 49.4 > > No SMP, mpsafenet=1, no PREEMPTION 53.1 > > No SMP, mpsafenet=0, no PREEMPTION 51.9 > > SMP, mpsafenet=1 351.7 > > SMP, mpsafenet=0 74.5 > > SMP, mpsafenet=1, no PREEMPTION 264.9 > > SMP, mpsafenet=0, no PREEMPTION 53.7 > > Which scheduler? BSD. As I say, I'm running 6.0-RC1 with the standard GENERIC kernel, apart from the options I have listed as being changed above. Polling is therefore also not enabled. When I get home, I'll have a play with both ULE and POLLING to see what difference they make, however ideally I'd like to not use polling in production if possible. Gavinhome | help
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