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

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Date:	Thu, 11 Feb 2010 22:58:21 +0100
From:	Wojciech Ploskonka <wploskonka@...il.com>
To:	Dimitrios Apostolou <jimis@....net>
CC:	Arjan van de Ven <arjan@...radead.org>, thomas@...hlinux.org,
	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 11.02.2010 19:00, Dimitrios Apostolou wrote:
> 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?

Sure Dimitris.
You can find lspci -vvv output from that unfortunate laptop in attachments.

-- 
Sincerely Yours,
Wojciech 'Wojo' Płoskonka


View attachment "lspci.txt" of type "text/plain" (31724 bytes)