Messages in this thread | | | Date | Thu, 11 Feb 2010 21:23:13 -0800 | From | Arjan van de Ven <> | Subject | Re: High cpu temperature with 2.6.32, bisection shows commit 69d258 (fwd) |
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On Thu, 11 Feb 2010 20:00:47 +0200 (EET) Dimitrios Apostolou <jimis@gmx.net> wrote:
> On Wed, 10 Feb 2010, Arjan van de Ven wrote: > > On Wed, 10 Feb 2010 22:51:38 +0200 (EET) > > Dimitrios Apostolou <jimis@gmx.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? > >
the old governor would not avoid c3, each time it would try it a bunch of times and eventually fall back... not very good, but mostly invisible to you.
-- 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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