Re: cpufreq longhaul locks up


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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Relevant Pages

  • Re: cpufreq longhaul locks up
    ... 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. ... What happens if you boot wihtout the ondemand governor but w/ ...
    (Linux-Kernel)
  • Re: cpufreq longhaul locks up
    ... I found that setting the cpufreq governor to ondemand making the box ... Sysrq ... does not work anymore, ...
    (Linux-Kernel)