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Re: XFS and 2.6.18 -> 2.6.20-rc3

To: "Mr. Berkley Shands" <bshands@xxxxxxxxx>
Subject: Re: XFS and 2.6.18 -> 2.6.20-rc3
From: David Chinner <dgc@xxxxxxx>
Date: Thu, 11 Jan 2007 09:08:43 +1100
Cc: David Chinner <dgc@xxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, Dave Lloyd <dlloyd@xxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <45A4EA2B.5050505@xxxxxxxxx>
References: <45A27BC7.2020709@xxxxxxxxx> <20070109012212.GG44411608@xxxxxxxxxxxxxxxxx> <20070109072535.GH44411608@xxxxxxxxxxxxxxxxx> <45A4EA2B.5050505@xxxxxxxxx>
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On Wed, Jan 10, 2007 at 07:29:15AM -0600, Mr. Berkley Shands wrote:
> With a fresh install of the O/S on a non-broken motherboard, the change to
> 
> /proc/sys/vm/dirty_ratio
> 
> restores most of the lost performance from 2.6.18,
> as of 2.6.20-rc4. The difference is 10% to 15% without the dirty_ratio
> change (40 is the default, 10 gives the old performance).

....

> So whatever needs to be tweaked in the VM system seems to be the key.
> 
> Thanks to all for getting this regression repaired.

Well, it's not repaired as such - you've got a WAR for the problem.
I'll report the problem to lkml so that the VM gurus can try to
really fix the problem....

Thanks for confirming that the dirty_ratio tweak also worked
for you.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group


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