Intel Linux Power Regression Still Being Worked On
Written by Michael Larabel in Intel on 12 December 2013 at 02:19 AM EST. 12 Comments
Intel
A few days back I wrote about an Intel Linux developer finding a 50 Watt power regression within the kernel since the 3.10 release. At first it looked like it might be easily solved, but the issue is still being investigated and Intel hardware engineers are now getting involved in the matter.

It looks like the Intel power regression on the Linux 3.10+ (through at least Linux 3.13 Git right now) might be more widespread than originally thought and for large, multi-socket systems could come down to large power consumption differences in not being allowed to fully idle. Len Brown wrote on Wednesday in a new mailing list post that he's now checking with the Intel hardware engineers about the matter.

The kernel developers do appear to have an understanding for the issue so hopefully the power issues will be solved in time for the Linux 3.13 kernel final release in the weeks ahead. New Linux power benchmarks are still forthcoming on Phoronix; hit up the mailing list thread if you want all the latest on the technical discussion surrounding this Intel CPU power issue on Linux.
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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 Twitter or contacted via MichaelLarabel.com.

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