linux-kernel - Re: Free memory never fully used, swapping

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Message-ID: <20101124064329.GB25170@hostway.ca>
Date:	Tue, 23 Nov 2010 22:43:29 -0800
From:	Simon Kirby <sim@...tway.ca>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: Free memory never fully used, swapping

On Tue, Nov 23, 2010 at 10:04:03AM +0000, Mel Gorman wrote:

> On Mon, Nov 22, 2010 at 03:44:19PM -0800, Andrew Morton wrote:
> > On Mon, 15 Nov 2010 11:52:46 -0800
> > Simon Kirby <sim@...tway.ca> wrote:
> > 
> > > I noticed that CONFIG_NUMA seems to enable some more complicated
> > > reclaiming bits and figured it might help since most stock kernels seem
> > > to ship with it now.  This seems to have helped, but it may just be
> > > wishful thinking.  We still see this happening, though maybe to a lesser
> > > degree.  (The following observations are with CONFIG_NUMA enabled.)
> > > 
> 
> Hi,
> 
> As this is a NUMA machine, what is the value of
> /proc/sys/vm/zone_reclaim_mode ? When enabled, this reclaims memory
> local to the node in preference to using remote nodes. For certain
> workloads this performs better but for users that expect all of memory
> to be used, it has surprising results.
> 
> If set to 1, try testing with it set to 0 and see if it makes a
> difference. Thanks

Hi Mel,

It is set to 0.  It's an Intel EM64T...I only enabled CONFIG_NUMA since
it seemed to enable some more complicated handling, and I figured it
might help, but it didn't seem to.  It's also required for
CONFIG_COMPACTION, but that is still marked experimental.

Simon-
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