Date: Mon, 5 Sep 2011 11:16:16 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: David Brodbeck <brodbd@uw.edu> Cc: freebsd-fs@freebsd.org Subject: Re: ZFSv28+NFSv4 poor file creation performance, "sync=disabled" has no effect Message-ID: <20110905091616.GD1662@garage.freebsd.pl> In-Reply-To: <CAHHaOuY=BEMrhYuzXtD5AtXG7niLXEO1yhO5P4EimcsLuTrLXw@mail.gmail.com> References: <CAHHaOuY=BEMrhYuzXtD5AtXG7niLXEO1yhO5P4EimcsLuTrLXw@mail.gmail.com>
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--iVCmgExH7+hIHJ1A Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 02, 2011 at 09:29:33AM -0700, David Brodbeck wrote: > I originally posted this on FreeBSD-questions, but it was suggested that I > bring it here. > I'm testing FreeBSD 9.0-BETA with an eye toward eventually using > FreeBSD 9.0 to replace some existing OpenSolaris 2008.11 > installations. I've found NFS file creation performance (as measured > by Bonnie++) is equally slow for both with default settings. However, > on OpenSolaris I disable the ZIL to improve file creation performance. > This tuning parameter was removed from FreeBSD 9.0; its replacement > is supposed to be the per-filesystem flag "sync", but setting this > flag seems to have no effect. >=20 > I did recompile the FreeBSD kernel without debugging features before > doing the tests, so I don't think this is a case of debugging code > slowing things down. >=20 > Here's the relevant data; these are all from bonnie++'s "sequential > create" benchmark. The NFS client was RedHat Enterprise Linux 5.6. >=20 > OpenSolaris 2008.11, default settings: 58/second > OpenSolaris 2008.11, with "zil_disable=3D1": 1258/second >=20 > FreeBSD 9.0-BETA, default settings: 107/second > FreeBSD 9.0-BETA, with "sync=3Ddisabled": 106/second >=20 > So it appears the "sync" ZFS parameter has no effect in FreeBSD. Has > anyone else seen this? Is there a way to improve NFS file creation > performance now that zil_disable has been removed? It would be good if you could try your test on FreeBSD directly. This way we could see if ZFS is to blame or NFS. --=20 Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://yomoli.com --iVCmgExH7+hIHJ1A Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAk5kk2AACgkQForvXbEpPzSrgQCg7xJH3ZJM2KsuwlS4b0LGI6Vt rFEAoOEbRXKqHID2yLZjaFz6PEJJRPbj =I40w -----END PGP SIGNATURE----- --iVCmgExH7+hIHJ1A--
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