Date: Fri, 17 Aug 2007 17:41:39 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "N. Harrington" <drumslayer2@yahoo.com> Cc: freebsd-fs@freebsd.org Subject: Re: Gjournal reporting 1/2 the speed of non journaled? What is the status of Gjournal? Message-ID: <20070817154139.GA1089@garage.freebsd.pl> In-Reply-To: <84373.93412.qm@web34511.mail.mud.yahoo.com> References: <84373.93412.qm@web34511.mail.mud.yahoo.com>
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[-- Attachment #1 --] On Thu, Aug 16, 2007 at 06:02:09PM -0700, N. Harrington wrote: > With ZFS, I have not seen much new going on with > gjournal. I am curious what the status of gjournal and > if it will likely be included with 6.3 (whenever that > is due) That was the plan, but I'm not yet sure if I'll find time to do it. > Also, as of late, I have been using it with > 6.2-STABLE via the patches and I seem to be getting > 1/2 the transfer speeds compared to non journaled > disks. It seems like this is recent as previous tests > showed it as quite fast. > > Any suggestions on why this could be happening > greatly appreciated. > > tested via > dd if=/dev/zero of=./testfile bs=16 count=16384 Gjournal is ~two times faster than UFS+SU for many small, random and parallel writes (such as running few 'tar x' processes), but is two times slower than UFS+SU for one sequential write stream, as there is no much that can be optimized there. > With disks getting larger and larger, why is it > taking so long for a journaled filesystem to be > standard on BSD? We have ZFS now, we don't need journaled file system:) -- Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFGxcGzForvXbEpPzQRAnX4AKCBQVAAhqJ5A/FUME2Zw+y++mlbFQCg+Xwf RKFNGrKlhENuO0DIBbMx9rk= =UuH1 -----END PGP SIGNATURE-----help
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