Re: cpufreq longhaul locks up

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

On May 4 2007 13:37, john stultz wrote:
>> 
>> I found that setting the cpufreq governor to ondemand making the box 
>> lock up solid in 2.6.20.2 and 2.6.21 after a few seconds. Sysrq 
>> does not work anymore, and the last messages are:
>> 
>> May  3 19:16:58 cn kernel: longhaul: VIA C3 'Nehemiah C' [C5P] CPU 
>> detected.  Powersaver supported.
>> May  3 19:16:58 cn kernel: longhaul: Using northbridge support.
>> May  3 19:17:22 cn kernel: Time: acpi_pm clocksource has been installed.
>> May  3 19:17:22 cn kernel: Clocksource tsc unstable (delta = -136422685 
>> ns)
>
>What happens if you boot wihtout the ondemand governor but w/
>clocksource=acpi_pm ?

I always let it boot with the default gov (performance), then
use cpufreq-set to change it.

acpi_pm+performance behaves like tsc+performance, which works

When switching from tsc+performance to (tsc+)ondemand, acpi_pm gets
used because of the unstable tsc (of course, since we changed
frequency and the cpu does NOT have constant_tsc), so it's
becoming acpi_pm+ondemand naturally.

Switching from acpi_pm+performance to acpi_pm+ondemand also
locks up after a few minutes.


Jan
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