linux-kernel - Re: cgroup task groups appears sensitive to absolute magnitude of shares

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Date:	Fri, 10 Oct 2008 09:05:30 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: cgroup task groups appears sensitive to absolute magnitude of
 shares

Peter Zijlstra wrote:
> On Fri, 2008-10-10 at 08:03 +0200, Peter Zijlstra wrote: 
>>On Thu, 2008-10-09 at 17:00 -0600, Chris Friesen wrote:

>>>Going to 4000/2000/1000/200 doesn't seem to give noticeable 
>>>improvements, and going to 40000/20000/10000/2000 causes the test to 
>>>behave unpredictably, either taking abnormally long to complete or else 
>>>not completing at all.
>>
>>Hmm, I would have expected it to work for at least the normal nice range
>>of weight values..
>>
>>Will have to look into that I suppose..

> One thought, are you running 32 or 64 bit? If you're on 32, could you
> try 64? If that fixes it its probably an easy fix, otherwise I fear it
> might take a bit more..

No such luck, this is 64-bit (powerpc though, not x86).  I tried 
reproducing it again today and was unable to reproduce the hang, but saw 
  delays of up to 7 seconds (where the expected delay is 10 sec).

Chris
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