Re: per_cpu_pagesets degrades MPI performance

From: Jack Steiner <steiner_at_sgi.com>
Date: 2005-04-05 13:02:12
On Tue, Apr 05, 2005 at 10:40:39AM +1000, Nick Piggin wrote:
> Jack Steiner wrote:
> 
> [snip nice detective work]
> 
> >Has anyone else seen this problem? I am considering adding
> >a config option to allow a site to control the batch size
> >used for per_cpu_pagesets. Are there other ideas that should 
> >be pursued? 
> >
> 
> What about using a non power of 2 for the batch? Like 5.
> If that helps, then we can make a patch to clamp it to a
> good value. At a guess I'd say a power of 2 +/- 1 might be
> the way to go.
> 
> Nick
> 
> -- 
> SUSE Labs, Novell Inc.

Sounds reasonable. I'll give it a try & see what happens.


-- 
Thanks

Jack Steiner (steiner@sgi.com)          651-683-5302
Principal Engineer                      SGI - Silicon Graphics, Inc.


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Received on Mon Apr 4 23:02:35 2005

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