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From: Dimitri Sivanich <sivanich@sgi.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <cl@gentwo.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	David Rientjes <rientjes@google.com>,
	Andi Kleen <andi@firstfloor.org>, Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH] cache align vm_stat
Date: Mon, 31 Oct 2011 08:37:49 -0500	[thread overview]
Message-ID: <20111031133749.GB17076@sgi.com> (raw)
In-Reply-To: <20111028155456.20f3d611.akpm@linux-foundation.org>

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@gentwo.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

WARNING: multiple messages have this Message-ID (diff)
From: Dimitri Sivanich <sivanich@sgi.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <cl@gentwo.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	David Rientjes <rientjes@google.com>,
	Andi Kleen <andi@firstfloor.org>, Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH] cache align vm_stat
Date: Mon, 31 Oct 2011 08:37:49 -0500	[thread overview]
Message-ID: <20111031133749.GB17076@sgi.com> (raw)
In-Reply-To: <20111028155456.20f3d611.akpm@linux-foundation.org>

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@gentwo.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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  parent reply	other threads:[~2011-10-31 13:37 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-24 16:10 [PATCH] cache align vm_stat Dimitri Sivanich
2011-10-24 16:10 ` Dimitri Sivanich
2011-10-27  2:31 ` Christoph Lameter
2011-10-27  2:31   ` Christoph Lameter
2011-10-28 22:54   ` Andrew Morton
2011-10-28 22:54     ` Andrew Morton
2011-10-29  5:22     ` Christoph Lameter
2011-10-29  5:22       ` Christoph Lameter
2011-10-31 13:37     ` Dimitri Sivanich [this message]
2011-10-31 13:37       ` Dimitri Sivanich
2011-10-27  8:50 Mel Gorman
2011-10-27  8:50 ` Mel Gorman
2011-10-27 12:51 ` Dimitri Sivanich
2011-10-27 12:51   ` Dimitri Sivanich
2011-10-27 14:29 ` Mel Gorman
2011-10-27 14:29   ` Mel Gorman

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