linux-ext4 - Re: delalloc is crippling fs

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Message-ID: <20080719172015.GB9424@mit.edu>
Date:	Sat, 19 Jul 2008 13:20:15 -0400
From:	Theodore Tso <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: delalloc is crippling fs_mark performance

On Sat, Jul 19, 2008 at 10:44:34AM -0500, Eric Sandeen wrote:
> 
> With delalloc, the lg_prealloc list seems to just grow & grow in
> ext4_mb_use_preallocated, searching up to 90,000 entries before finding
> something, I think this is what's hurting - I need to look into how this
> should work.

Hmm, this may explain Holger's benchmark regressions.

							- Ted
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