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Date: Wed, 27 Mar 2002 16:29:31 -0800
From: Andrew Morton <akpm@zip.com.au>
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To: Matthew Kirkwood <matthew@hairy.beasts.org>
CC: Andi Kleen <ak@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: Filesystem benchmarks: ext2 vs ext3 vs jfs vs minix
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Matthew Kirkwood wrote:
> 
> On Wed, 27 Mar 2002, Andrew Morton wrote:
> 
> > > Yeah, I thought it was a little odd.  Postgres does so much
> > > fsync()ing that I thought it may just have been that the lower
> > > overhead won out over ext2's cleverer layout.  All the I/O was
> > > basically fsync-driven, so this test was only about write
> > > performance.
> >
> > For fsync-intensive loads ext3's best mode is generally
> > data=journal.  That way, an fsync is satisfied by a nice
> > single linear write to the journal.
> 
> Here we are.  This is with just a 200Mb journal (the partition
> is only a little over 1Gb, and the datafiles grow fairly big,
> so I didn't brave making it any bigger).
> 
>         tuning? single  ir      mx-ir   oltp    mixed-oltp
>                 (sec)   (tps)   (sec)   (tps)   (sec)
> ext3    bn      1285.32 65.98   1996.41 90.05   307.79
> ext3-wb bn      1287.31 98.42   2149.38 125.13  236.02
> ext3-jd bn      1306.90 72.07   1813.54 125.15  305.27

Oh well.

It sounds like a useful and valid workload to optimise
for.  So I'll take you up on the offer of those scripts,
please.

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