linux-kernel - Re: [PATCH] cache align vm

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Message-ID: <20111031133749.GB17076@sgi.com>
Date:	Mon, 31 Oct 2011 08:37:49 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...two.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] cache align vm_stat

On Fri, Oct 28, 2011 at 03:54:56PM -0700, Andrew Morton wrote:
> On Wed, 26 Oct 2011 21:31:46 -0500 (CDT)
> Christoph Lameter <cl@...two.org> wrote:
> 
> > On Mon, 24 Oct 2011, Dimitri Sivanich wrote:
> > 
> > > Avoid false sharing of the vm_stat array.
> 
> Did we have some nice machine-description and measurement results which
> can be included in the changelog?  Such things should always be
> included with a performace patch!
> 
Tests run on a 640 cpu UV system.

With 120 threads doing parallel writes, each to different tmpfs mounts:
No patch:		~300 MB/sec
With vm_stat alignment:	~430 MB/sec
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