From: Jack Steiner <steiner@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: akpm@osdl.org, hugh@veritas.com, linux-mm@kvack.org,
linux-ia64@vger.kernel.org
Subject: Re: per_cpu_pagesets degrades MPI performance
Date: Mon, 4 Apr 2005 22:02:12 -0500 [thread overview]
Message-ID: <20050405030212.GA10812@sgi.com> (raw)
In-Reply-To: <4251DE87.10002@yahoo.com.au>
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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next prev parent reply other threads:[~2005-04-05 3:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-04 19:28 Jack Steiner
2005-04-05 0:40 ` Nick Piggin
2005-04-05 3:02 ` Jack Steiner [this message]
2005-04-07 18:52 ` Jack Steiner
2005-04-08 0:41 ` Nick Piggin
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