linux-kernel - Re: [patch] CFS scheduler, -v12

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Date:	Wed, 30 May 2007 12:18:18 +1000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <nickpiggin@...oo.com.au>,
	Con Kolivas <kernel@...ivas.org>,
	Christoph Lameter <clameter@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] CFS scheduler, -v12

Siddha, Suresh B wrote:
> On Tue, May 29, 2007 at 04:54:29PM -0700, Peter Williams wrote:
>>> I tried with various refresh rates of top too.. Do you see the issue
>>> at runlevel 3 too?
>> I haven't tried that.
>>
>> Do your spinners ever relinquish the CPU voluntarily?
> 
> Nope. Simple and plain while(1); 's
> 
> I can try 32-bit kernel to check.

Don't bother.  I just checked 2.6.22-rc3 and the problem is not present 
which means something between rc2 and rc3 has fixed the problem.  I hate 
it when problems (appear to) fix themselves as it usually means they're 
just hiding.

I didn't see any patches between rc2 and rc3 that were likely to have 
fixed this (but doesn't mean there wasn't one).  I'm wondering whether I 
should do a git bisect to see if I can find where it got fixed?

Could you see if you can reproduce it on 2.6.22-rc2?

Thanks
Peter
-- 
Peter Williams                                   pwil3058@...pond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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