lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
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/

Powered by blists - more mailing lists