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Date: Mon, 20 Jun 2011 22:15:47 -0400 From: pradeep hettiarachchi <pradeepmh@...ne.edu> To: linux-kernel@...r.kernel.org, arjan@...radead.org Subject: CPU Instantaneous Power Consumption Hi, I am a PhD student and doing a research which involves control-theoretic real-time process/job scheduling. Here is my question: I need to calculate the power consumption of a single or two CPU cores and equivalent Thermal Dissipation accurately. I did not find any supporting material from Intel to find the instantaneous power consumption (and thermal dissipation) of the CPU. Therefore I am trying some alternative path; I measure the CPU regulator input current (using a very small shunt resister in series with 4 pin CPU ATX connector). Also, assuming that the CPU voltage regulator operates at 12 V rated, I could calculate the input power to the CPU regulator. However without knowing the following I cannot complete my power calculation: 1) What is the DC-to-DC CPU regulator efficiency ? 2) What is the relationship between TDP and input power to the CPU ? 3) Do you suggest any other better method to calculate the instantaneous input power to the CPU ? (I can think of calculating accurate instantaneous CPU power as VID (corresponding Vcc) x CPU_current_from_regulator; but, how do I read instantaneous VID ? Is there any MSR that I can instantly access to read VID ? (I think Intel has hidden theses details from system developer) ) Please help me to find answers to these questions. Sincerely, Pradeep M. Hettiarachchi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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