From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: lmbench ctxsw regression with CFS
Date: Thu, 2 Aug 2007 09:19:56 +0200 [thread overview]
Message-ID: <20070802071956.GA23300@elte.hu> (raw)
In-Reply-To: <20070802024132.GD15595@wotan.suse.de>
* Nick Piggin <npiggin@suse.de> wrote:
> > One thing to check out is whether the lmbench numbers are "correct".
> > Especially on SMP systems, the lmbench numbers are actually *best*
> > when the two processes run on the same CPU, even though that's not
> > really at all the best scheduling - it's just that it artificially
> > improves lmbench numbers because of the close cache affinity for the
> > pipe data structures.
>
> Yes, I bound them to a single core.
could you send me the .config you used?
Ingo
next prev parent reply other threads:[~2007-08-02 7:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-02 2:15 lmbench ctxsw regression with CFS Nick Piggin
2007-08-02 2:31 ` Linus Torvalds
2007-08-02 2:41 ` Nick Piggin
2007-08-02 7:19 ` Ingo Molnar [this message]
2007-08-02 7:31 ` Nick Piggin
2007-08-02 15:44 ` Ingo Molnar
2007-08-03 0:14 ` Nick Piggin
2007-08-04 6:50 ` Ingo Molnar
2007-08-06 3:29 ` Nick Piggin
2007-08-13 12:30 ` Jens Axboe
2007-08-14 3:00 ` Andrew Morton
2007-08-14 3:23 ` Nick Piggin
2007-08-16 21:28 ` Siddha, Suresh B
2007-08-14 3:25 ` David Miller
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