[ltp] Time spent in C3 cpu state ?

[Michael Kamper]

Damien Challet wrote:

> My own stats: 
> 
> T41 2373-GEG: 50%, x21 and 600E with PIII@450MHz: 85% 
> 
> Is there any way to improve the usage of C3 ?

Interesting, my CPU never enters C3 and almost never C1.

Here is the output of cat /proc/acpi/processor/CPU/power

active state:            C2
max_cstate:              C8
bus master activity:     000017ff
states:
    C1:                  type[C1] promotion[C2] demotion[--]
latency[001] usage[00000010]
   *C2:                  type[C2] promotion[C3] demotion[C1]
latency[001] usage[18084072]
    C3:                  type[C3] promotion[--] demotion[C2]
latency[085] usage[00000000]

My Notebook is a X31.
How do you make your CPUs enter C3?

Michael