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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. -- 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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