linux-kernel - Frequency Scaling on Intel Core 2 Duo Processors

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Message-ID: <8fe204b0910260806l10896f9foc0568dd0b8f4b6ca@mail.gmail.com>
Date:	Mon, 26 Oct 2009 11:06:23 -0400
From:	pradeep hettiarachchi <pradeepmh@...ne.edu>
To:	linux-kernel@...r.kernel.org
Subject: Frequency Scaling on Intel Core 2 Duo Processors

Hi,

I am working on a research in real-time systems. If I want to change
the frequency of the system as rapidly as possible, what is the best
method ? At the moment I write MSR_IA32_PERF_CTL, MSR directly with
the pre-found(calculated, encoded) values** for different frequencies.
I found the entire transition (latency) takes multiple milliseconds to
complete; however, I want some faster method to change the CPU
frequency.
Thank you in advance.

-Pradeep

** Initially I change the CPU frequency by some other method, such as
methods provided by an available user-space governor, and record the
MSR_IA32_PERF_STATUS values corresponding to that frequency. Later, I
change the relevant bits of MSR_IA32_PERF_CTL, with the values I got
previously, to achieve the relevant anticipated speed.
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