linux-kernel - Re: Erroneous package power limit notification since kernel 2.6.39

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Message-ID: <4E0A4F56.90806@gmx.net>
Date:	Wed, 29 Jun 2011 00:01:58 +0200
From:	Olaf Freyer <aaron667@....net>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Florian Mickler <florian@...kler.org>,
	linux-kernel@...r.kernel.org,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Keith Packard <keithp@...thp.com>,
	dri-devel@...ts.freedesktop.org
Subject: Re: Erroneous package power limit notification since kernel 2.6.39

Am 28.06.2011 23:18, schrieb Jesse Barnes:
> On Tue, 28 Jun 2011 23:09:45 +0200
> Olaf Freyer <aaron667@....net> wrote:
>>>>> I'd guess ccab5c82759e2ace74b2e84f82d1e0eedd932571 could be the
>>>>> cause. Can you check if the appended revert of that commit makes
>>>>> things disappear? 
>>>> It seems like you guessed perfectly correct - reverting the commit makes
>>>> those notifications go away at once.
>>>>
>>> Without this reverted you see messages?  I missed the earlier stuff,
>>> what message are you seeing?
>>>
>> Since 2.6.39 I saw those as soon as I start up the xserver:
>>
>> May 22 14:41:34 localhost kernel: [   57.525848] CPU0: Package power
>> limit notification (total events = 1)
>> May 22 14:41:34 localhost kernel: [   57.536904] CPU0: Package power
>> limit normal
> Ok interesting, didn't realize X startup was so GPU intensive. :)
>
> The patch you reverted will definitely cause the GPU to ramp up its
> frequency much faster than before, but it sounds like on your system
> you might also see it with the revert if you run something GPU
> intensive like nexuiz.
>
> The CPU (and by extension the GPU) will take care of itself though; if
> things get too hot or over power, it will clock throttle to keep itself
> in a safe range.
I also see the message alot during my daily average usage of my computer
(just using Firefox, Thunderbird and IntelliJ) - seeing things like
CPU3: Package power limit notification (total events = 90809)
after a normal day in the office became normal since 2.6.39.

I just gave nexuiz a try for about 30 minutes with the reversal patch
applied -
and not a single message appeared in my logs.

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