Frequency scaling not working
Aaron Konstam
akonstam at sbcglobal.net
Thu Nov 22 20:31:23 UTC 2007
On Thu, 2007-11-22 at 10:59 -0600, Mikkel L. Ellertson wrote:
> Aaron Konstam wrote:
> > When I issue the commands above I get:
> > [akonstam at cyrus ~]$ cat /proc/acpi/processor/CPU0/throttling
> > state count: 8
> > active state: T0
> > state available: T0 to T7
> > states:
> > *T0: 00%
> > T1: 12%
> > T2: 25%
> > T3: 37%
> > T4: 50%
> > T5: 62%
> > T6: 75%
> > T7: 87%
> > [akonstam at cyrus ~]$
> > cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
> > 1867000 1600000 1333000 1067000 800000
> >
> > Now the second set of numbers are the ones I actually see as cpu
> > frequencies. The first makes no sense at all. Can any one explain the
> > output?
> >
> The T0 through T7 are throttle settings number 0 through 7. So you
> would use a value of 4 to throttle the CPU to 50%. If hte CPU
> supports only 3 different throttle settings, I would ounl expect to
> see T0 through T3.
However, I see only the cpuspeeds (5 of them) displayed by:
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
So why are there 8 throttle settings? What setting would give me no
throttling? It is a mystery.
--
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A baby is an alimentary canal with a loud voice at one end and no
responsibility at the other.
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam at sbcglobal.net
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