Re: ACPI throttling to death?

[Jan Frey <jfrey-Mmb7MZpHnFY@public.gmane.org>]

On Tuesday 05 April 2005 18:38, Stefan Dösinger wrote:
> Am Montag, 4. April 2005 20:14 schrieb Jan Frey:
> > Hi,
> >
> > I'm observing strange behaviour with a Gericom notebook running a
> > 2.6.9 vanilla kernel with custom configuration. The processor used is
> > a P III (Tualatin) with 1.2GHz (which is quite rarely used). It is
> > *not* a mobile processor (no speedstep etc.), instead it supports 16
> > throttling levels.
> >
> > Sometimes (I guess when the machine is getting overheated - the
> > notebook design is really bad and the fan is quite lousy) ACPI
> > temperature monitor shows >70 degrees (Celsius) and the system starts
> > throttling.
> >
> > Until here everything is fine IMO.
> > But what happens next is that the systems slows down continuously (you
> > can monitor the current throttling level going up and up) until it
> > reaches the last level (12%). Soon after that the whole machine is
> > locked up hard, display still showing the current graphics. I guess it
> > throttled to a "deathly" 0%...
> >
> > Is this more a linux acpi problem or a fault in this particular
> > machine? What could be done about it? how can I debug further?
>
> My desktop machine locked up if it got to hot(70-75 degrees, amd duron
> processor). I bought a better CPU fan and the problem is gone. Well,
> that's impossible on notebooks.
>
> Is there a 0% throttling level? What happens if you stop processor
> hungry tasks to allow the machine to cool down?

No, there is no 0% level. Unfortunately this also does not seem to be 
related to any level of CPU utilization: sometimes the machines locks up 
even if it is nearly idle, e.g. writing/sending email...

Really astonishing: CPU temperature seems to go up to roughly 70 degrees 
quite quickly and then it stays there nearly forever: it does not matter 
whether CPU load is 0 or 1.. And: throttling also does not lower CPU temp, 
I thought this would be main reason...

Br
Jan


-- 
Jan Frey
jfrey-Mmb7MZpHnFY@public.gmane.org


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