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    SubjectRe: High CPU temp on Athlon MP w/ recent 2.6 kernels
    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!

    -jo
    --
    -rw-r--r-- 1 jo users 80 2004-04-07 19:37 /home/jo/.signature
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