From: "Andrew Theurer" <habanero@us.ibm.com>
To: "Michael Hohnbaum" <hohnbaum@us.ibm.com>,
<torvalds@transmeta.com>, <mingo@elte.hu>,
<linux-kernel@vger.kernel.org>
Cc: "Erich Focht" <efocht@ess.nec.de>,
"Martin J. Bligh" <Martin.Bligh@us.ibm.com>
Subject: Re: [PATCH] NUMA Scheduler - rev 4
Date: Wed, 16 Oct 2002 20:21:40 -0500 [thread overview]
Message-ID: <010e01c2757b$920e8ed0$2a060e09@beavis> (raw)
In-Reply-To: 1034807518.9367.910.camel@dyn9-47-17-164.beaverton.ibm.com
> Linus, Ingo,
>
> Attached is a small patch which provides NUMA awareness to the
> O(1) scheduler. This patch retains the identical O(1) scheduler
> behavior for SMP systems. For multi-node systems it favors
> runqueues on the current node when looking for another runqueue
> to pull tasks from. It also makes a balance decision at exec().
> This patch is against 2.5.43.
>
> On NUMA systems these two changes have shown performance gains
> in the 5 - 10% range depending on tests. Some micro-benchmarks
> provided by Erich Focht which stress the memory subsystem show
> a doubling in performance.
>
> Please consider applying this patch.
FYI, to make sure there was no degrade for non numa systems, I just benched
a kernel compile on an IBM 8500R, with/without your patch. Compile times
were 38.880 (vanilla) and 38.818 (numa sched).
Andrew Theurer
prev parent reply other threads:[~2002-10-17 1:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-16 22:31 [PATCH] NUMA Scheduler - rev 4 Michael Hohnbaum
2002-10-17 1:21 ` Andrew Theurer [this message]
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