Date: Fri, 26 Sep 2008 16:41:22 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Gavin Atkinson <gavin@FreeBSD.org> Cc: freebsd-hackers@FreeBSD.org, freebsd-stable@FreeBSD.org Subject: Re: bad NFS/UDP performance Message-ID: <E1KjDZS-000Juj-Vd@cs1.cs.huji.ac.il> In-Reply-To: <1222430498.2993.1.camel@buffy.york.ac.uk> References: <E1Kj7NA-000FXz-3F@cs1.cs.huji.ac.il> <1222430498.2993.1.camel@buffy.york.ac.uk>
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> On Fri, 2008-09-26 at 10:04 +0300, Danny Braniss wrote: > > Hi, > > There seems to be some serious degradation in performance. > > Under 7.0 I get about 90 MB/s (on write), while, on the same machine > > under 7.1 it drops to 20! > > Any ideas? > > The scheduler has been changed to ULE, and NFS has historically been > very sensitive to changes like that. You could try switching back to > the 4BSD scheduler and seeing if that makes a difference. If it does, > toggling PREEMPTION would also be interesting to see the results of. > > Gavin I'm testing 7.0-stable vs 7.1-prerelease, and both have ULE. BTW, the nfs client hosts I'm testing are idle. danny
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