Re: [Powertop] Does PowerTop support MHz numbers for Intel Xeon L5410 CPUs ?
On (07/07/14 08:25), Arjan van de Ven wrote:
>not sure that powertop performs any specific MSRs at all, since
most of MSRs are
>called correspondingly to c-state flags (has_cXXX), e.g.
>
>__init:
> if (model == 0x45 || model ==0x3D)
> has_c8c9c10_res = 1;
>
>
>
>and later:
>
> if (has_c8c9c10_res) {
> c8_before = get_msr(number, MSR_PKG_C8_RESIDENCY);
> c9_before = get_msr(number, MSR_PKG_C9_RESIDENCY);
> c10_before = get_msr(number, MSR_PKG_C10_RESIDENCY);
> }
>
> and so on.
but if the set is empty, you don't get any data, and the "emulation" side
of powertop
is likely a better choice... since there are C states, just not counters.
looks like powertop checks C6 state `get_msr(number, MSR_PKG_C6_RESIDENCY)' in start
and end measurement for any intel cpu, along with `get_msr(first_cpu, MSR_TSC)'.
anyway,
need to investigate. the output that Valentin sees is rather strange, saying that cpu0
is 138% Idle.
CPU 0
Idle 138%
CPU 2
Idle 111,7%
CPU 1
Idle 111,7%
CPU 3
Idle 111,7%
-ss