[CentOS-virt] No cpu throttling for Xeon E5405?
RedShift
redshift at pandora.beSat May 23 06:16:28 UTC 2009
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Dennis J. wrote: > Hi, > we bought some machines with 2 x quad core Xeon E5405 processors and > installed centos 5.3 on them. My problem is that I can't get the cpuspeed > service to work. No driver seems to claim responsibility for the throttling > and the fallback "modprobe acpi_cpufreq" in the cpuspeed init script just > yields a "No such device" message. According to the acpi information the > CPUs should support this just fine: > > cat /proc/acpi/processor/CPU0/info: > processor id: 0 > acpi id: 0 > bus mastering control: yes > power management: no > throttling control: yes > limit interface: yes > > cat /proc/acpi/processor/CPU0/throttling: > state count: 8 > active state: T0 > states: > *T0: 00% > T1: 12% > T2: 25% > T3: 37% > T4: 50% > T5: 62% > T6: 75% > T7: 87% > > At least half of the cores aren't really used at the moment under non-peak > load so we are wasting quite a bit of power with this. Any idea on how to > get this working? > > Regards, > Dennis FYI, throttling is not the same as frequency scaling. If your CPU is throttling it usually means it's overheating. Glenn
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