Re: [Powertop] Does PowerTop support MHz numbers for Intel Xeon L5410 CPUs ?

[Sergey Senozhatsky <sergey.senozhatsky at gmail.com>]

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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