From: Ingo Molnar <mingo@elte.hu>
To: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Con Kolivas <kernel@kolivas.org>, Nick Piggin <npiggin@suse.de>,
Mike Galbraith <efault@gmx.de>,
Arjan van de Ven <arjan@infradead.org>,
Peter Williams <pwil3058@bigpond.net.au>,
Thomas Gleixner <tglx@linutronix.de>,
caglar@pardus.org.tr, Willy Tarreau <w@1wt.eu>,
Gene Heskett <gene.heskett@gmail.com>, Mark Lord <lkml@rtr.ca>,
Zach Carter <linux@zachcarter.com>,
buddabrod <buddabrod@gmail.com>
Subject: Re: [patch] CFS scheduler, -v8
Date: Wed, 2 May 2007 12:05:45 +0200 [thread overview]
Message-ID: <20070502100545.GA6857@elte.hu> (raw)
In-Reply-To: <463854F3.3020403@linux.vnet.ibm.com>
* Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> With -v7 I would run the n/n+1 test. Basically on a system with n
> cpus, I would run n+1 tasks and see how their load is distributed. I
> usually find that the last two tasks would get stuck on one CPU on the
> system and would get half the cpu time as their other peers. I think
> this issue has been around for long even before CFS. But while I was
> investigating that, I found that with -v8, all the n+1 tasks are stuck
> on the same cpu.
i believe this problem is specific to powerpc - load is distributed fine
on i686/x86_64 and your sched_debug shows a cpu_load[0] == 0 on CPU#2
which is 'impossible'. (I sent a few suggestions off-Cc about how to
debug this.)
Ingo
next prev parent reply other threads:[~2007-05-02 10:06 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-01 21:22 [patch] CFS scheduler, -v8 Ingo Molnar
2007-05-02 2:57 ` Ting Yang
2007-05-02 5:10 ` Willy Tarreau
2007-05-02 5:30 ` William Lee Irwin III
2007-05-02 10:05 ` Bill Huey
2007-05-02 10:27 ` Ingo Molnar
2007-05-02 17:36 ` Srivatsa Vaddagiri
2007-05-02 17:48 ` William Lee Irwin III
2007-05-02 18:15 ` Ingo Molnar
2007-05-02 18:56 ` William Lee Irwin III
2007-05-02 19:12 ` Ingo Molnar
2007-05-02 19:42 ` William Lee Irwin III
2007-05-03 2:48 ` Ting Yang
2007-05-03 3:18 ` Ting Yang
2007-05-03 10:19 ` Bill Huey
2007-05-02 23:41 ` Ting Yang
2007-05-02 18:42 ` Li, Tong N
2007-05-02 19:10 ` William Lee Irwin III
2007-05-03 3:07 ` Ting Yang
2007-05-03 8:50 ` Ingo Molnar
2007-05-03 14:26 ` Srivatsa Vaddagiri
2007-05-03 15:19 ` Ting Yang
2007-05-03 15:02 ` Ting Yang
2007-05-02 6:37 ` Mike Galbraith
2007-05-02 6:45 ` Ingo Molnar
2007-05-02 8:03 ` Gene Heskett
2007-05-02 8:12 ` Mike Galbraith
2007-05-02 8:48 ` Gene Heskett
2007-05-02 8:13 ` Ingo Molnar
2007-05-02 8:51 ` Gene Heskett
2007-05-02 7:59 ` Mike Galbraith
2007-05-02 8:11 ` Gene Heskett
2007-05-02 10:40 ` Ingo Molnar
2007-05-02 9:08 ` Balbir Singh
2007-05-02 10:05 ` Ingo Molnar [this message]
2007-05-02 10:59 ` Balbir Singh
2007-05-02 11:17 ` Ingo Molnar
2007-05-05 8:31 ` Esben Nielsen
2007-05-05 17:44 ` Linus Torvalds
2007-05-06 8:29 ` Ingo Molnar
2007-05-06 8:36 ` Willy Tarreau
2007-05-06 8:52 ` Ingo Molnar
2007-05-06 17:45 ` Linus Torvalds
2007-05-07 11:30 ` Esben Nielsen
2007-05-07 15:55 ` Ingo Molnar
2007-05-07 16:11 ` Linus Torvalds
2007-05-08 0:35 ` Peter Williams
2007-05-08 9:05 ` Esben Nielsen
2007-05-09 0:01 ` Peter Williams
2007-05-10 13:09 ` Pavel Machek
2007-05-11 16:50 ` Linus Torvalds
2007-05-11 19:18 ` Pavel Machek
2007-05-11 19:37 ` Willy Tarreau
2007-05-11 20:53 ` Kevin Bowling
2007-05-07 11:09 ` Esben Nielsen
2007-05-07 16:28 ` Linus Torvalds
2007-05-07 18:39 ` Johannes Stezenbach
2007-05-07 18:55 ` Linus Torvalds
2007-05-08 7:34 ` Esben Nielsen
2007-05-08 9:54 ` Johannes Stezenbach
2007-05-08 10:27 ` Esben Nielsen
2007-05-08 5:36 ` Matt Mackall
2007-05-02 12:58 ` Mark Lord
2007-05-02 12:58 ` Vegard Nossum
2007-05-02 16:41 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2007-05-03 8:20 Zoltan Boszormenyi
2007-05-03 13:02 ` Ingo Molnar
2007-05-03 13:29 ` Damien Wyart
2007-05-03 14:53 ` Srivatsa Vaddagiri
2007-05-03 15:53 ` William Lee Irwin III
2007-05-03 18:44 ` Li, Tong N
2007-05-03 19:52 ` William Lee Irwin III
2007-05-07 14:22 ` Srivatsa Vaddagiri
2007-05-07 20:54 ` Li, Tong N
2007-05-07 0:04 ` Bill Davidsen
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