linux-kernel - Re: High cpu temperature with 2.6.32, bisection shows commit 69d258 (fwd)

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Date:	Thu, 11 Feb 2010 20:00:47 +0200 (EET)
From:	Dimitrios Apostolou <jimis@....net>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	thomas@...hlinux.org, Wojciech Ploskonka <wploskonka@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Chiang <achiang@...com>, Len Brown <lenb@...nel.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: High cpu temperature with 2.6.32, bisection shows commit 69d258
 (fwd)

On Wed, 10 Feb 2010, Arjan van de Ven wrote:
> On Wed, 10 Feb 2010 22:51:38 +0200 (EET)
> Dimitrios Apostolou <jimis@....net> wrote:
>>
>> As I understand, in his case the C3 state is unstable and exits
>> immediately. I have asked him to post the dmidecode output so you can
>> put him on the exception list too. However I now believe that more
>> and more users will be facing the same problem, it's not something
>> you find easily, especially on desktop machines! What do you think?
>
> if C3 does not work, this needs to be fixed in the code that implements
> C3, not in the code that selects C3.
>
>
> Modern systems should have working C3; if one does not it needs to be
> investigated as to why it's not working. One cause could be a PME that
> we're not handling (I've seen that a few times in our lab), lspci -vvv
> will show that.
>
> But regardless, it's not the task of the code that selects a C state to
> deal with....

Wojo (CC'd) can you run as root lspci -vvv and attach the output, so the 
experts can have a look?

Arjan, in this case a bisection was not performed but the symptoms are 
exactly the same as mine:
* powertop showing thousands of interrups but showing no specific process 
causing them
* The situation is caused only when the "processor" module is inserted and 
after a message about "marking TSC as unstable due to halts in idle", 
exactly like my case

Hmmm actually a difference is that in my case the system used the acpi_pm 
clocksource, but in Wojo's case it used hpet.

If I understand correctly what you said, this is a bug in another piece of 
code, and I assume that the previous behaviour of the governor was hiding 
it, avoiding C3 state completely, right?


Dimitris

>
>
>
> -- 
> Arjan van de Ven 	Intel Open Source Technology Centre
> For development, discussion and tips for power savings,
> visit http://www.lesswatts.org
>
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