Date: Fri, 06 Nov 2009 14:11:54 -0700 From: Michael Loftis <mloftis@wgops.com> To: freebsd-stable@freebsd.org Subject: Re: Performance issues with 8.0 ZFS and sendfile/lighttpd Message-ID: <94A540AC0E2A75B7CA3ED7F7@[192.168.1.44]> In-Reply-To: <696A0DF1-020B-48CB-BF38-6605EAD5BF1E@wanderview.com> References: <772532900-1257123963-cardhu_decombobulator_blackberry.rim.net-1402739480-@bda715.bisx.prod.on.blackberry> <hcma4s$c49$1@ger.gmane.org> <4AEEBD4B.1050407@quip.cz> <hcmhbj$40s$1@ger.gmane.org> <5275583A0E66749DA096A22F@[192.168.1.44]> <696A0DF1-020B-48CB-BF38-6605EAD5BF1E@wanderview.com>
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--On Friday, November 06, 2009 3:31 PM -0500 Ben Kelly <ben@wanderview.com> wrote: > Have you tried adjusting vfs.zfs.arc_meta_limit? I've noticed the > default value for this is set poorly when the overall ARC size is small. > This happens because various structure's not actually allocated from the > ARC like dnodes and dbufs are included in the metadata usage stats. When > the ARC is large this is somewhat negligible, but for small ARCs it > overwhelms the calculated default metadata limit and you end up not > caching any real file system metadata. > > You could try increasing the metadata limit or even better increase your > maximum ARC size to something over 1GB. (I seem to remember your ARC > size is 128M from earlier in the thread). Nope, that was someone else, not setting any ARC limits (or any ZFS settings at all actually). > > Hope that helps. > > - Ben >
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