linux-kernel - Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers

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Message-ID: <alpine.DEB.2.00.1009280748590.4144@router.home>
Date:	Tue, 28 Sep 2010 07:49:40 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Bron Gondwana <brong@...tmail.fm>
cc:	Robert Mueller <robm@...tmail.fm>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web
 servers

On Tue, 28 Sep 2010, Bron Gondwana wrote:

> Is this what's happening, or is IO actually coming from disk in preference
> to the remote node?  I can certainly see the logic behind preferring to
> reclaim the local node if that's all that's happening - though the OS should
> be allocating the different tasks more evenly across the nodes in that case.

Not sure about the disk. I did not see anything that would indicate and
issue with only being able to do 32 bit and I am no expert on the device
driver operations.

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