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From: Christoph Lameter <clameter@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: David Chinner <dgc@sgi.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown
Date: Thu, 11 Jan 2007 19:04:50 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0701111903110.31979@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <45A6D118.5030508@yahoo.com.au>

On Fri, 12 Jan 2007, Nick Piggin wrote:

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

But it wont do anything since it only comes into action if you have an off 
node allocation. If you run a NUMA kernel on an SMP system then you only 
have one node. There is no way that an off node allocation can occur.

> > 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.

zone reclaim is not touching dirty pages in its default configuration. It 
would only remove up clean pagecache pages.



  reply	other threads:[~2007-01-12  3:05 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-10 22:37 David Chinner
2007-01-10 23:04 ` Christoph Lameter
2007-01-10 23:08   ` David Chinner
2007-01-10 23:12     ` Christoph Lameter
2007-01-10 23:18       ` David Chinner
2007-01-10 23:13     ` Nick Piggin
2007-01-11  0:31       ` David Chinner
2007-01-11  0:43         ` Christoph Lameter
2007-01-11  1:06           ` David Chinner
2007-01-11  1:40             ` Christoph Lameter
2007-01-11  2:57               ` David Chinner
2007-01-11  1:08         ` Nick Piggin
2007-01-11  1:24           ` David Chinner
2007-01-11  9:27             ` Nick Piggin
2007-01-11 17:51               ` Christoph Lameter
2007-01-12  0:06                 ` Nick Piggin
2007-01-12  3:04                   ` Christoph Lameter [this message]
     [not found]           ` <20070111063555.GB33919298@melbourne.sgi.com>
2007-01-11  9:23             ` Nick Piggin
2007-01-11  1:11     ` David Chinner

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