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Reduce Linux power consumption, Part 1: The CPUfreq subsystem

Sep 16, 2009, 17:34 (0 Talkback[s])
(Other stories by Jenifer Hopper)

[ Thanks to An Anonymous Reader for this link. ]

"The Linux CPUfreq subsystem

"Starting with the 2.6.0 Linux kernel, you can dynamically scale processor frequencies through the CPUfreq subsystem. When processors operate at a lower clock speed, they consume proportionately less power and generate less heat. This dynamic scaling of the clock speed gives some control in throttling the system to consume less power when not operating at full capacity.

"The CPUfreq structure makes use of governors and daemons for setting a static or dynamic power policy for the system. The dynamic governors, which I discuss later in this article, can switch between CPU frequencies based on CPU utilization to allow for power savings while not sacrificing performance. These governors also allow for some user tuning so you can customize and easily change the frequency scaling. In addition, the sched_mc_power_savings and sched_smt_power_savings settings make use of consolidating threads to save power."

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