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Message-ID: <1331137905.11248.355.camel@twins>
Subject: Re: runnable tasks never making it to a runqueue where they can run?
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Roland Dreier <roland@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Date: Wed, 07 Mar 2012 17:31:45 +0100
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On Tue, 2012-03-06 at 18:19 -0800, Roland Dreier wrote:
> 6,7,8,10,18,19,22 but never onto 23

>   (Interestingly, those 8 CPUs seem to form a domain) 

That would be 'interesting'... I have a similar wsm box and you should
have a domain setup like:

0-5,12-17  (node 0)
6-11,18-23 (node 1)

Where the first set (0-5 & 6-11) is smt0 and the second set (12-17 &
18-23) smt1.

Can you boot with sched_debug and send me both /proc/cpuinfo and dmesg?