From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jack Steiner <steiner@sgi.com>
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: Tue, 05 Apr 2005 00:40:39 +0000 [thread overview]
Message-ID: <4251DE87.10002@yahoo.com.au> (raw)
In-Reply-To: <20050404192827.GA15142@sgi.com>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jack Steiner <steiner@sgi.com>
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: Tue, 05 Apr 2005 10:40:39 +1000 [thread overview]
Message-ID: <4251DE87.10002@yahoo.com.au> (raw)
In-Reply-To: <20050404192827.GA15142@sgi.com>
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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next prev parent reply other threads:[~2005-04-05 0:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-04 19:28 per_cpu_pagesets degrades MPI performance Jack Steiner
2005-04-04 19:28 ` Jack Steiner
2005-04-05 0:40 ` Nick Piggin [this message]
2005-04-05 0:40 ` Nick Piggin
2005-04-05 3:02 ` Jack Steiner
2005-04-05 3:02 ` Jack Steiner
2005-04-07 18:52 ` Jack Steiner
2005-04-07 18:52 ` Jack Steiner
2005-04-08 0:41 ` Nick Piggin
2005-04-08 0:41 ` Nick Piggin
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