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From: Olof Johansson <olof@lixom.net>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: Scheduler(?) regression from 2.6.22 to 2.6.24 for short-lived threads
Date: Fri, 8 Feb 2008 18:32:20 -0600	[thread overview]
Message-ID: <20080209003220.GA21395@lixom.net> (raw)
In-Reply-To: <20080209000829.GA29986@elte.hu>

On Sat, Feb 09, 2008 at 01:08:30AM +0100, Ingo Molnar wrote:
> 
> * Olof Johansson <olof@lixom.net> wrote:
> 
> > 2.6.22: 3332 ms
> > 2.6.23: 4397 ms
> > 2.6.24: 8953 ms
> > 2.6.24-git19: 8986 ms
> 
> if you enable SCHED_DEBUG, and subtract 4 from the value of 
> /proc/sys/kernel/sched_features, does it get any better?
> 
> if not, does writing 0 into /proc/sys/kernel/sched_features have any 
> impact?

Doesn't seem to make a difference, either of them. I can unfortunately
not retest on x86 at the moment, only powerpc. But it made no noticable
difference in runtime w/ pasemi_defconfig and current mainline.


-Olof

  reply	other threads:[~2008-02-09  0:30 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-09  0:04 Olof Johansson
2008-02-09  0:08 ` Ingo Molnar
2008-02-09  0:32   ` Olof Johansson [this message]
2008-02-09  7:58 ` Mike Galbraith
2008-02-09  8:03   ` Willy Tarreau
2008-02-09 10:58     ` Mike Galbraith
2008-02-09 11:40       ` Willy Tarreau
2008-02-09 13:37         ` Mike Galbraith
2008-02-09 16:19           ` Willy Tarreau
2008-02-09 17:33             ` Mike Galbraith
2008-02-10  5:29             ` Olof Johansson
2008-02-10  6:15               ` Willy Tarreau
2008-02-10  7:00                 ` Olof Johansson
2008-02-10  7:58                   ` Willy Tarreau
2008-02-11  8:15                   ` Mike Galbraith
2008-02-11 17:26                     ` Olof Johansson
2008-02-11 19:58                       ` Mike Galbraith
2008-02-11 20:31                         ` Olof Johansson
2008-02-12  9:23                           ` Mike Galbraith
2008-02-13  5:49                             ` Mike Galbraith
2008-02-11 21:45               ` Bill Davidsen
2008-02-12  4:30                 ` Mike Galbraith
     [not found] <fa.6N2dhyJ1cmBqiuFKgCaYfwduM+0@ifi.uio.no>
2008-02-09  1:49 ` Robert Hancock

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