White Papers

Processor Power Management Features and Process Scheduler: Do We Need to Tie Them Together?

Overview Power savings is a key focus area in today's microprocessors, with almost all latest microprocessors providing wide variety of power saving features. Processor P-state is the capability of running the processor at different voltage and/or frequency levels. Processor C-state is the processor capability to go into various low power idle states (with varying wakeup latency). Linux kernel policies like cpufreq-ondemand governor and cpuidle-menu governor make effective use of these processor power management features, giving power savings to the end user. This paper looks at various inter-relations between Linux power management features and process scheduler. In particular, it covers various issues and mechanisms for incorporating power management related information in process scheduler.

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Publisher
Intel
File Format
PDF
Date Published
Nov 26, 2008
Format
White Papers
Topics
Microprocessors, Processors, Linux - Open Source

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