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Another Major Linux Power Regression Spotted

Michael Larabel

Published on 25 April 2011
Written by Michael Larabel
Page 4 of 4 - 38 Comments

When pounding the CPU with the OpenSSL benchmark, again it clearly illustrates changes with the Linux 2.6.35 and 2.6.38 kernels for the worse. The battery power consumption rate goes up by 18% with the Linux 2.6.35 kernel and another 4% with Linux 2.6.38.

This is simply the composite result when aggregating all of the data from the five previous tests. Up to the Linux 2.6.35 kernel, the ThinkPad R52 has an overall average battery power consumption rate of 21~22 Watts, then in Linux 2.6.35 goes up to 25 Watts, and now with the Linux 2.6.38 kernel has a 26 Watt average with a 31 Watt peak for the MPlayer / Stream / OpenArena / OpenSSL loads.

The investigation continues and more tests should come. Your feedback is also welcome about this Linux kernel power consumption testing or general performance testing and test practices so that performance monitoring and continuous integration can be improved for Linux and open-source projects. Contact me or let me know on Twitter or PTS Commercial for other services.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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