linux-kernel - Re: filesystem benchmarking fun

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Message-Id: <20070516123342.714a11d8.akpm@linux-foundation.org>
Date:	Wed, 16 May 2007 12:33:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Chuck Ebbert <cebbert@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: filesystem benchmarking fun

On Wed, 16 May 2007 15:13:39 -0400
Chris Mason <chris.mason@...cle.com> wrote:

> > 
> > If that's still working then the problem will _probably_ be directory
> > writeout.  Possibly inodes, but they should be well-laid-out.
> > 
> > Were you using dir_index?  That might be screwing things up.
> 
> Yes, dir_index.  A quick test of mkfs.ext3 -O ^dir_index seems to still
> have the problem.  Even though the inodes are well laid out, is the
> order they get written sane?

Should be: it uses first-fit.

>  Looks like ext3 is just walking a list of
> bh/jh, maybe we can just sort the silly thing?

The IO scheduler is supposed to do that.

But I don't know what's causing this.
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