From: Tomasz Chmielewski <mangoo@wpkg.org>
To: Andreas Dilger <adilger@sun.com>
Cc: Theodore Tso <tytso@mit.edu>, Andi Kleen <andi@firstfloor.org>,
LKML <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-raid@vger.kernel.org
Subject: Re: very poor ext3 write performance on big filesystems?
Date: Wed, 27 Feb 2008 21:25:49 +0100 [thread overview]
Message-ID: <47C5C74D.3050508@wpkg.org> (raw)
In-Reply-To: <20080227200335.GB9331@webber.adilger.int>
Andreas Dilger schrieb:
> I'm CCing the linux-raid mailing list, since I suspect they will be
> interested in this result.
>
> I would suspect that the "journal guided RAID recovery" mechanism
> developed by U.Wisconsin may significantly benefit this workload
> because the filesystem journal is already recording all of these
> block numbers and the MD bitmap mechanism is pure overhead.
Also, using anticipatory IO scheduler seems to be the best option for an
array with lots of seeks and random reads and writes (quite
surprisingly, closely followed by NOOP - both were behaving much better
than deadline or CFQ).
Here are some numbers I posted to BackupPC mailing list:
http://thread.gmane.org/gmane.comp.sysutils.backup.backuppc.general/14009
--
Tomasz Chmielewski
http://wpkg.org
next prev parent reply other threads:[~2008-02-27 20:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-18 12:57 very poor ext3 write performance on big filesystems? Tomasz Chmielewski
2008-02-18 14:03 ` Andi Kleen
2008-02-18 14:16 ` Theodore Tso
2008-02-18 15:02 ` Tomasz Chmielewski
2008-02-18 15:16 ` Theodore Tso
2008-02-18 15:57 ` Andi Kleen
2008-02-18 15:35 ` Theodore Tso
2008-02-20 10:57 ` Jan Engelhardt
2008-02-20 17:44 ` David Rees
2008-02-20 18:08 ` Jan Engelhardt
2008-02-18 16:16 ` Tomasz Chmielewski
2008-02-18 18:45 ` Theodore Tso
2008-02-18 15:18 ` Andi Kleen
2008-02-18 15:03 ` Theodore Tso
2008-02-19 14:54 ` Tomasz Chmielewski
2008-02-19 15:06 ` Chris Mason
2008-02-19 15:21 ` Tomasz Chmielewski
2008-02-19 16:04 ` Chris Mason
2008-02-19 18:29 ` Mark Lord
2008-02-19 18:41 ` Mark Lord
2008-02-19 18:58 ` Paulo Marques
2008-02-19 22:33 ` Mark Lord
2008-02-27 11:20 ` Tomasz Chmielewski
2008-02-27 20:03 ` Andreas Dilger
2008-02-27 20:25 ` Tomasz Chmielewski [this message]
2008-03-01 20:04 ` Bill Davidsen
2008-02-19 9:24 ` Vladislav Bolkhovitin
[not found] <9YdLC-75W-51@gated-at.bofh.it>
[not found] ` <9YeRh-Gq-39@gated-at.bofh.it>
[not found] ` <9Yf0W-SX-19@gated-at.bofh.it>
[not found] ` <9YfNi-2da-23@gated-at.bofh.it>
[not found] ` <9YfWL-2pZ-1@gated-at.bofh.it>
[not found] ` <9Yg6H-2DJ-23@gated-at.bofh.it>
2008-02-19 13:14 ` Paul Slootman
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