Messages in this thread | | | Date | Wed, 7 Apr 2004 20:14:41 +0200 | From | Joerg Sommrey <> | Subject | Re: High CPU temp on Athlon MP w/ recent 2.6 kernels |
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In linux.kernel you write:
>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).
lmsensors might be correct here as there is a sample config from Tyan for my board. C2_cnt shows that amd76x_pm is indeed working. Otherwise I had expected a much higher temperature.
>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
Did that.
>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.
Bingo! Currently running 2.6.5-mm1 at 42.0/43.5°C!
>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)
Wouldn't be a bad idea to document this :-)
Thanks!
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