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CPU temperature control

OT Padraig Brady 3 participants 3 messages Aug 24, 2001

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Padraig Brady

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Hi,

I'm using a C3 700MHz CPU underclocked to 466MHz (66MHz FSB), and @ full load I'm getting the CPU to 63°C in a fanless 1U case. What I would like is to throttle the CPU back X% if the temperature exceeds say 50% which I can easily read using lm sensors. So, what's the best way to do this? user space / kernel space?? Note the C3 has a suspend on halt (instruction) option which will help things also.

cheers,
Padraig.

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Quoted 7 lines · Padraig Brady

I'm using a C3 700MHz CPU underclocked to 466MHz (66MHz FSB), and @ full load I'm getting the CPU to 63°C in a fanless 1U case. What I would like is to throttle the CPU back X% if the temperature exceeds say 50% which I can easily read using lm sensors. So, what's the best way to do this? user space / kernel space?? Note the C3 has a suspend on halt (instruction) option which will help things also.

Russell King has been working on a architecture independant framework for this kind of feature. I recently started work on VIA support for it. After this weekend, my socket 370 motherboard should turn up and I'll be able to test / finish the support for it.

You can find the code so far at..
cvs -d :pserver:[email protected]:/mnt/src/cvsroot login cvs -d :pserver:[email protected]:/mnt/src/cvsroot co cpufreq

So far, there are several implementations in there, in various stages of completion. The various x86 types need finishing, and it'll be ready (as long as rmk has nothing else to add to it) for submission.

regards,

Dave.

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| Dave Jones.        http://www.suse.de/~davej
| SuSE Labs
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In reply to Padraig Brady
Quoted 3 lines · Dave Jones

So far, there are several implementations in there, in various stages of completion. The various x86 types need finishing, and it'll be ready (as long as rmk has nothing else to add to it) for submission.

I don't have anything to add to the generic layer; it needs a little cleanup to remove the "this is debug only" comments against the proc interface.

--
Russell King ([email protected]) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html