[Xen-users] xen 4.3 power savings

[jacek burghardt <jaceksburghardt@xxxxxxxxx>]

I have xeons 5520 how do I configure xen 4.3 to lower cpu clocks ?

cpufreq=dom0-kernel cpuidle

I read power management under xen wiki but command 

xenpm set-scaling-governor ondeman

Gives

[CPU0] failed to set governor name (19 - No such device)
[CPU1] failed to set governor name (19 - No such device)
[CPU2] failed to set governor name (19 - No such device)
[CPU3] failed to set governor name (19 - No such device)
[CPU4] failed to set governor name (19 - No such device)
[CPU5] failed to set governor name (19 - No such device)
[CPU6] failed to set governor name (19 - No such device)
[CPU7] failed to set governor name (19 - No such device)

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