Re: per_cpu_pagesets degrades MPI performance

From: Nick Piggin <nickpiggin_at_yahoo.com.au>
Date: 2005-04-05 10:40:39
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.

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Received on Mon Apr 4 20:40:58 2005

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