linux-kernel - Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown

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Message-ID: <20070111011105.GV33919298@melbourne.sgi.com>
Date:	Thu, 11 Jan 2007 12:11:05 +1100
From:	David Chinner <dgc@....com>
To:	David Chinner <dgc@....com>
Cc:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown

On Thu, Jan 11, 2007 at 10:08:55AM +1100, David Chinner wrote:
> On Wed, Jan 10, 2007 at 03:04:15PM -0800, Christoph Lameter wrote:
> > On Thu, 11 Jan 2007, David Chinner wrote:
> > 
> > > The performance and smoothness is fully restored on 2.6.20-rc3
> > > by setting dirty_ratio down to 10 (from the default 40), so
> > > something in the VM is not working as well as it used to....
> > 
> > dirty_background_ratio is left as is at 10?
> 
> Yes.

FWIW, setting dirty_ratio to 20 instead of 10 fixes the most of
the erraticness of the writeback and most of the performance as well.

Cheers,

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