Question on xenpm

Question on xenpm

[Carsten Schiers]

Dear all,

after having upgraded my server from AMD 4050e to X4 640, I now use cpufreq=xen and had
to adapt a munin script (monitoring tool) to display the residency in the different P-states.
This script uses /sys/device/system/cpu/cpu0/cpufreq to read out the information, whereas
I now use xenpm get-cpufreq-state.

Before I noticed that the CPU is in highest possible P-state (lowest frequences) nearly all 
of the time, and a minimal percentage in the lowest. Now I can see a 50/50 distribution. 
Interesting enough, the xenpm get-cpuidle-state will show that the CPUs are at aprox. 90%
in C1 idle state.

Can there be a difference in how the two methods to collect the info are working? I mean 
something like xenpm will not count residency when in C1, but cpufreq driver will normaly
do?

BR,
Carsten.

AW: Question on xenpm

[Carsten Schiers]

Just a short addon-question, xenpm get-cpufreq-para will currently leave
the scaling driver blank. How can I make sure that the powernow driver is
used?

Thanks,
Carsten.

----- Originalnachricht -----
Von: Carsten Schiers <carsten@schiers.de>
Gesendet: Mon, 5.7.2010 11:09
An: xen-devel@lists.xensource.com
Betreff: [Xen-devel] Question on xenpm

Dear all,

after having upgraded my server from AMD 4050e to X4 640, I now use cpufreq=xen and had
to adapt a munin script (monitoring tool) to display the residency in the different P-states.
This script uses /sys/device/system/cpu/cpu0/cpufreq to read out the information, whereas
I now use xenpm get-cpufreq-state.

Before I noticed that the CPU is in highest possible P-state (lowest frequences) nearly all 
of the time, and a minimal percentage in the lowest. Now I can see a 50/50 distribution. 
Interesting enough, the xenpm get-cpuidle-state will show that the CPUs are at aprox. 90%
in C1 idle state.

Can there be a difference in how the two methods to collect the info are working? I mean 
something like xenpm will not count residency when in C1, but cpufreq driver will normaly
do?

BR,
Carsten.

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