Date: Tue, 29 May 2007 17:04:28 -0400 From: Kris Kennaway <kris@obsecurity.org> To: St?le Kristoffersen <staalebk@ifi.uio.no> Cc: freebsd-fs@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: ZFS performance Message-ID: <20070529210427.GA50838@rot13.obsecurity.org> In-Reply-To: <20070529202805.GB16557@eschew.pusen.org> References: <46487565.40205@tychl.net> <20070528231218.GA14746@eschew.pusen.org> <20070529185456.GA48827@rot13.obsecurity.org> <20070529202805.GB16557@eschew.pusen.org>
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On Tue, May 29, 2007 at 10:28:05PM +0200, St?le Kristoffersen wrote: > On 2007-05-29 at 14:54, Kris Kennaway wrote: > > On Tue, May 29, 2007 at 01:12:18AM +0200, St?le Kristoffersen wrote: > > > On 2007-05-14 at 10:42, Nick Gustas wrote: > > > > I see the same behavior that St?le is seeing, I can "fix" it by setting > > > > vfs.zfs.prefetch_disable="1" in loader.conf. I'm assuming something in > > > > the prefetch code isn't quite right? > > > > > > Ah, this _greatly_ improved the usability of my fileserver! Thanks for the > > > tip :) > > > > How does filesystem performance change? I thought ZFS needs to do > > prefetching to improve read performance. > > How the performance changed was dramatically, it went from beeing about > useless for doing anything other than watching one stream from it, to > tackle several concurrent streams without problems. I whish prefetching > would work correctly, it should improve performance even more. Well, that is one aspect of performance, but prefetching is presumably important for other workloads. Kris
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