Date: Fri, 27 Aug 2010 16:06:33 -0400 From: Scott Ullrich <sullrich@gmail.com> To: Martin Matuska <mm@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: [CFT] ZFS ACL and rrwlock speedup Message-ID: <AANLkTikoH5wbCJ0WkPF8gXMRKsjCY-tLf8JTCs3qxr63@mail.gmail.com> In-Reply-To: <4C739C55.3020800@FreeBSD.org> References: <4C739C55.3020800@FreeBSD.org>
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2010/8/24 Martin Matuska <mm@freebsd.org>: > Dear FreeBSD community, > > in my last CFT I presented a patch that improves ZFS write speed. There > have been easily portable improvements on the read side in OpenSolaris, > too. Of course, the improvement here is by far not that dramatic as in > the zfs_metaslab.patch, but OpenSolaris developers claim this also > improves the speed of stat() calls. > > I would like to Call For Testing for the following patch (9-CURRENT): > http://people.freebsd.org/~mm/patches/zfs/zfs_abe_stat_rrwlock.patch > > This patch adds the following: > - better ACL caching and speedup of the ACL permission checks > - lowered mutex contention in the read/writer lock (rrwlock) > - several bugfixes > > This patch does not interfere with the zfs_metaslab.patch > > To apply the patch against 8-STABLE, you need to apply the v15 update first: > http://people.freebsd.org/~mm/patches/zfs/v15/stable-8-v15.patch > > The patch imports the following OpenSolaris onnv revisions: > 9749 (without zlook), 9866, 9981, 10143, 10232, 10295, 10250, 10269 > > And covers the following OpenSolaris Bug IDs: > 6802734 Support for Access Based Enumeration (not used on FreeBSD) > 6844861 inconsistent xattr readdir behavior with too-small buffer > 6848431 zfs with rstchown=0 or file_chown_self privilege allows user to > "take" ownership > 6775100 stat() performance on files on zfs should be improved > 6827779 rrwlock is overly protective of its counters > 6857433 memory leaks found at: zfs_acl_alloc/zfs_acl_node_alloc > 6860318 truncate() on zfsroot succeeds when file has a component of its > path set without access permission > 6865875 zfs sometimes incorrectly giving search access to a dir > 6870564 panic in zfs_getsecattr > 6867395 zpool_upgrade_007_pos testcase panic'd with BAD TRAP: type=e > (#pf Page fault) > 6868276 zfs_rezget() can be hazardous when znode has a cached ACL So far so good on this patch as well. Running it for a good 3 days with 4TB and it is nice and fast (220MB/sec for 1.5 TB drives). Scott
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