Re: [PATCH] cache align vm_stat

[Dimitri Sivanich]

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@xxxxxxxxxx> 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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