Messages in this thread | | | Date | Tue, 23 Sep 2008 19:30:38 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: Unified tracing buffer |
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On Tue, 23 Sep 2008, Masami Hiramatsu wrote: > > So if you can test this, try it with > > (a) cpufreq at a fixed _low_ value (to not cause overheating) > > (b) with the spray-can cooling the thing and cpufreq at a fixed high > > value > > and see if the TSC is constant then. > > Hi Linus, > > Thank you for your advice. I tested it again according your advice, > I did: > - service cpuspeed stop > - echo 1000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed > and checked /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq is > 1000000. > - echo 1 > /proc/acpi/thermal_zone/THM/polling_frequency > - cooling with spray-can :) > - cat /proc/acpi/thermal_zone/THM/temperature > temperature: 39 C > > and ran the test. > --- > p0: c:1107576, ns:990280 ratio:111 > p0: c:1805640, ns:1008787 ratio:178 > p0: c:1998324, ns:1000127 ratio:199 > p0: c:946380, ns:990280 ratio:95 > p0: c:871728, ns:1000267 ratio:87 > p0: c:1807380, ns:1007949 ratio:179 > p0: c:1784808, ns:1000127 ratio:178 > p0: c:1768488, ns:991676 ratio:178 > p0: c:1802292, ns:1008299 ratio:178 > p0: c:1787088, ns:1000406 ratio:178 > p0: c:1999176, ns:1000896 ratio:199 > p0: c:881364, ns:991956 ratio:88 > p0: c:1802712, ns:1008019 ratio:178 > p0: c:1787088, ns:998590 ratio:178 > --- > this seems not so stable yet. :-( > > After test I checked temperature again. > # cat /proc/acpi/thermal_zone/THM/temperature > temperature: 39 C > > Hmm, 39 C is not so high. I wouldn't be surprised even if this > is an individual product bug. Anyway, currently, Linux itself > works well on this laptop with hpet.:-)
Do you have C-States enabled on that machine ?
ls /sys/devices/system/cpu/cpu0/cpuidle/
has it more than a state0 entry ?
If yes, please do:
cat /sys/devices/system/cpu/cpu0/cpuidle/stateX/usage
where X is the highest number in there.
cat /proc/acpi/processor/CPU0/power
might be useful as well.
Thanks,
tglx
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