linux-kernel - Re: Fwd: Nice processes prevent frequency increases - possible scheduler regression (known good in 2.6.35)

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Date:	Mon, 05 Nov 2012 08:54:02 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	Michal Zatloukal <myxal.mxl@...il.com>
CC:	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org
Subject: Re: Fwd: Nice processes prevent frequency increases - possible scheduler
 regression (known good in 2.6.35)

On 11/03/2012 09:40 AM, Michal Zatloukal wrote:
> On Sat, Nov 3, 2012 at 12:48 PM, Mike Galbraith<efault@....de>  wrote:
>> On Sat, 2012-11-03 at 04:33 -0700, Mike Galbraith wrote:
>>> On Fri, 2012-11-02 at 21:09 +0100, Michal Zatloukal wrote:

>>> Your nice 19 tasks receiving 'too much' CPU when there are other
>>> runnable tasks around sounds like you have SCHED_AUTOGROUP enabled.
>>
>> (forgot to mention: if that's the case, you can add noautogroup to your
>> kernel command line to turn it off if distro turned it on in .config)
>>
>
> Thanks, Ubuntu's kernel is indeed configured with that option enabled,
> and passing "noautogroup" at grub restores the previous behaviour. I'm
> back to happy days again :) BTW, isn't this the "magic 200-line patch"
> I was reading about ~2 years ago?

Yes.

Chris
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