linux-kernel - Re: [resend][PATCH] mm: increase RECLAIM

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Message-ID: <alpine.DEB.2.00.1010081044530.30029@router.home>
Date:	Fri, 8 Oct 2010 10:45:16 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Rob Mueller <robm@...tmail.fm>,
	linux-kernel@...r.kernel.org, Bron Gondwana <brong@...tmail.fm>,
	linux-mm <linux-mm@...ck.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [resend][PATCH] mm: increase RECLAIM_DISTANCE to 30

On Fri, 8 Oct 2010, Balbir Singh wrote:

> I am not sure if this makes sense, since RECLAIM_DISTANCE is supposed
> to be a hardware parameter. Could you please help clarify what the
> access latency of a node with RECLAIM_DISTANCE 20 to that of a node
> with RECLAIM_DISTANCE 30 is? Has the hardware definition of reclaim
> distance changed?

10 is the local distance. So 30 should be 3x the latency that a local
access takes.

> I suspect the side effect is the zone_reclaim_mode is not set to 1 on
> bootup for the 2-4 socket machines you mention, which results in
> better VM behaviour?

Right.

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