Messages in this thread | | | From | Pasi Savolainen <> | Subject | Re: High CPU temp on Athlon MP w/ recent 2.6 kernels | Date | Tue, 6 Apr 2004 23:27:37 +0000 (UTC) |
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* Joerg Sommrey <jo@sommrey.de>: > On Tue, Apr 06, 2004 at 04:26:37PM -0400, Gene Heskett wrote: >> >> But join the 70C club, that AMD athlon keeps itself at a medium simmer >> full time. Mine has been running 67-72C for 3 years now. Strangly, >> shutting down setiathome doesn't cool it by more than a couple >> degrees C. And, its got a $50 all copper Glaciator cooler on it, >> heavy heavy heavy. > > That's not quite my point. I am not afraid of running my athlons at > 70C. I just don't want to. With Debian Woody they ran at <40C, which > is impressing IMHO. An upgrade to Sarge raised the temp for about 5K, > which is still very cool. This temperature didn't change when I > upgraded to an early 2.6 kernel. Just after 2.6.3-mm4 there was this > jump for 10K that I just do not understand. It doesn't hurt the athlons > but seems unnecessary to me.
At least on A7M266-D lmsensors read thermal sensors very wrong. I haven't got time to contact devs with that, but I do know for sure that amd76x_pm really does make cooling calls, even in 2.6.5-rc3-mm3 (There should be /sys/devices/pci0000\:00/0000\:00\:00.0/C2_cnt file, which tells how many times has amd76x_pm really made the disconnection call).
One issue is that from some kernel version amd76x_pm's idle() is called upto 3.5x times more often when there's some audio activity. So in effect number of calls to default_idle() jumps from 1100Hz to 3800Hz. (this is reproducible with 'rhytmbox' -application, but not with xmms. AFAIK my xmms uses OSS emulation and rhytmbox is native alsa.)
Ahem. Could you actually try: echo 3 > /sys/devices/pci0000\:00/0000\:00\:00.0/lazy_idle
This could help gaining 5-8°C. HZ changed from 100 to 1000 in 2.6, so amd76x_pm old default doesn't apply overly well here.
There's some funniness going on with this tunable. It doesn't really affect how many times/second we call amd76x_pm.idle(), but rather how easily we go into sleep (no sleep if both CPU's aren't idle). With lazy_idle at 3 I get bad distortions with bttv card. with 3000 they disappear, but so does the thermal throttling :)
(Sorry for lack of coherence right now)
-- Psi -- <http://www.iki.fi/pasi.savolainen>
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