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

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Message-ID: <45A6D118.5030508@yahoo.com.au>
Date:	Fri, 12 Jan 2007 11:06:48 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
CC:	David Chinner <dgc@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown

Christoph Lameter wrote:
> On Thu, 11 Jan 2007, Nick Piggin wrote:
> 
> 
>>You're not turning on zone_reclaim, by any chance, are you?
> 
> 
> It is not a NUMA system so zone reclaim is not available.

Ah yes... Can't you force it on if you have a NUMA complied kernel?

> zone reclaim was 
> already in 2.6.16.

Well it was a long shot, but that is something that has had a few
changes recently and is something that could interact badly with
the global pdflush.

-- 
SUSE Labs, Novell Inc.
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