Configuring Intel RAPL power limits

Configuring Intel RAPL power limits

Hi,

I am currently using an Intel Sandy bridge processor and I'm trying to measure the power consumed by various components within the package using the Intel power governer version 68; At the moment, I see two issues with the tool that is provided to us.

a) The readings for power consumption with a granularity less than 1 second are wrong. For example:

 s ./power_gov -e 1000
root's password:
PKG_0,Core_0,Graphics_0,Uncore_0,
4.46,0.62,0.11,3.73,
4.49,0.64,0.11,3.74,
4.58,0.73,0.11,3.74,
4.48,0.63,0.11,3.74,
4.48,0.64,0.11,3.73,
4.55,0.70,0.11,3.74,
4.61,0.76,0.11,3.74,
4.74,0.89,0.11,3.74,
6.76,2.90,0.11,3.75,
4.57,0.73,0.11,3.74,
4.41,0.56,0.11,3.74,

s ./power_gov -e 500
PKG_0,Core_0,Graphics_0,Uncore_0,
5.72,1.83,0.11,3.78,
4.47,0.61,0.11,3.75,
4.53,0.69,0.11,3.74,
4.58,0.73,0.11,3.74,
4.71,0.85,0.11,3.75,
4.45,0.60,0.11,3.74,
4.78,0.92,0.11,3.75,
4.62,0.78,0.11,3.74,
4.74,0.88,0.11,3.75,
4.50,0.66,0.11,3.74,
4.59,0.74,0.11,3.75,
4.63,0.80,0.11,3.73,
4.84,0.99,0.11,3.75,
5.29,1.43,0.11,3.76,
4.56,0.72,0.11,3.74,

I am assuming the total power consumption to be half in each row when compared to the one second (same system state assumed)

b) I am unable to cap the average power over a time window for the core power domain.
s ./power_gov -r POWER_LIMIT -s 30 -d PP0
over a time window of 100 milliseconds.

And when I try to cap the power for the PKG power domain, It asks me to disable the RAPL lock in the BIOS. As I see, there is no setting for RAPL lock in the BIOS.

Addiitional Information:

Intel(R) Core(TM) i7-2760QM CPU @ 2.40GHz
Linux linux-epq2.site 3.7.10-1.16-desktop #1 SMP PREEMPT Fri May 31 20:21:23 UTC 2013 (97c14ba) x86_64 x86_64 x86_64 GNU/Linux

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Hello Rajiv,

Can you post your questions to the power governor web page? You'll get answers from the guys who created the utility. I'll delete this posting after a while.

Pat

Posting it there.

The link is in your original post...

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