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

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Message-ID: <Pine.LNX.4.64.0701101510520.23052@schroedinger.engr.sgi.com>
Date:	Wed, 10 Jan 2007 15:12:02 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	David Chinner <dgc@....com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown

On Thu, 11 Jan 2007, David Chinner wrote:

> Well, pdflush appears to be doing very little on both 2.6.18 and
> 2.6.20-rc3. In both cases kswapd is consuming 10-20% of a CPU and
> all of the pdflush threads combined (I've seen up to 7 active at
> once) use maybe 1-2% of cpu time. This occurs regardless of the
> dirty_ratio setting.

That sounds a bit much for kswapd. How many nodes? Any cpusets in use?

A upper maximum on the number of pdflush threads exists at 8. Are these 
multiple files or single file transfers?

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