Reduce Linux power consumption, Part 3: Tuning results

"Power efficiency is an important consideration for anyone concerned with business costs or environmental issues. In this final article in the series, let's look at the difference in power efficiency (in real numbers and charts) that you get from tuning the Linux CPUfreq subsystem and in-kernel governors to change the processor's operating frequency without having a major impact on performance.

"In Part 2, you saw how to use and tune the governors, so now you'll see some governor effects. I use two popular workloads to compare performance and power consumption and show how a tuned governor can provide power savings without sacrificing performance:

"A workload from the SPECpower_ssj2008 benchmark that evaluates both power and performance

"A workload from an e-commerce shopping application that gathers many statistics during a simulated online shopping session, including latency times and the number of requests per second."

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