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

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Message-ID: <20101008165930.GH5327@balbir.in.ibm.com>
Date:	Fri, 8 Oct 2010 22:29:30 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux.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

* Christoph Lameter <cl@...ux.com> [2010-10-08 10:45:16]:

> 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.
>

Does this patch then imply that we should do zone_reclaim only for 3x
nodes and not 2x nodes as we did earlier.
 
> > 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.
> 

-- 
	Three Cheers,
	Balbir
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