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

[Valentin Hoebel <valentin.hoebel at nfon.com>]

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Hi,

not sure if this is an important information or not, but I am getting 
the "138% idle" behaviour for all of the systems where reading out the 
current CPU frequencies via PowerTop is not possible.

Best regards
Valentin


Am 08.07.2014 13:05, schrieb Sergey Senozhatsky:
> 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
>

-- 
Mit freundlichen Grüßen

Valentin Höbel
Cloud Architect

NFON AG
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