From: Cyrus Massoumi <cyrusm@gmx.net>
To: Micah Dowty <micah@vmware.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: High priority tasks break SMP balancer?
Date: Sat, 10 Nov 2007 00:56:07 +0100 [thread overview]
Message-ID: <4734F397.7080802@gmx.net> (raw)
In-Reply-To: <20071109223417.GB16250@vmware.com>
Hi Micah
> On my machine (2-way Opteron with a vanilla 2.6.23.1 kernel) this test
> program will reliably put the scheduler into a state where one CPU has
> both of the busy-looping processes in its runqueue, and the other CPU
> is usually idle. The usually-idle CPU will have a very high cpu_load,
> as reported by /proc/sched_debug.
I tried your program on my machine (C2D, 2.6.17, O(1) scheduler).
Both CPUs are 100% busy all the time. Each busy-looping thread is
running on its own CPU. I've been watching top output for 10 minutes,
the spreading is stable and the threads don't bounce at all.
greetings
Cyrus
next prev parent reply other threads:[~2007-11-09 23:55 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-09 22:34 High priority tasks break SMP balancer? Micah Dowty
2007-11-09 23:56 ` Cyrus Massoumi [this message]
2007-11-10 0:11 ` Micah Dowty
2007-11-14 18:39 ` Micah Dowty
2007-11-15 18:48 ` Kyle Moffett
2007-11-15 19:14 ` Micah Dowty
2007-11-15 20:07 ` Christoph Lameter
2007-11-15 20:24 ` Micah Dowty
2007-11-15 21:28 ` Christoph Lameter
2007-11-15 21:35 ` Micah Dowty
2007-11-16 2:31 ` Christoph Lameter
2007-11-16 2:44 ` Micah Dowty
2007-11-16 6:07 ` Ingo Molnar
2007-11-16 9:19 ` Micah Dowty
2007-11-16 10:45 ` Ingo Molnar
2007-11-16 10:48 ` Micah Dowty
2007-11-16 22:12 ` Christoph Lameter
2007-11-16 10:48 ` Dmitry Adamushko
2007-11-16 22:14 ` Micah Dowty
2007-11-16 23:26 ` Dmitry Adamushko
2007-11-17 1:03 ` Micah Dowty
2007-11-17 19:10 ` Dmitry Adamushko
2007-11-19 18:51 ` Micah Dowty
2007-11-19 22:22 ` Dmitry Adamushko
2007-11-19 23:05 ` Micah Dowty
2007-11-20 5:57 ` Ingo Molnar
2007-11-20 18:06 ` Micah Dowty
2007-11-20 21:47 ` Dmitry Adamushko
2007-11-22 7:46 ` Micah Dowty
2007-11-22 12:53 ` Dmitry Adamushko
2007-11-26 19:44 ` Micah Dowty
2007-11-27 9:21 ` Dmitry Adamushko
2007-11-27 17:13 ` Micah Dowty
2007-11-16 19:13 ` David Newall
2007-11-16 21:38 ` Micah Dowty
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