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SubjectRe: Unified tracing buffer
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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