Linux 3.10 Gets New ARM, AMD Power Improvements
Written by Michael Larabel in Linux Kernel on 30 April 2013 at 10:19 AM EDT. Add A Comment
Along with an assortment of other power management improvements to land with the Linux 3.10 kernel, a cpufreq driver for ARM's big.LITTLE is being introduced. There's also a cpufreq driver for the Exynos 5440 quad-core and the new AMD frequency sensitivity feedback support.

In the power management pull request for Linux 3.10, PM subsystem maintainer Rafael J. Wysocki confirms the most interesting feature is the cpufreq driver for big.LITTLE.

Should you not be familiar with the big.LITTLE architecture, it's about pairing low-power processor cores with more powerful -- but more power-consuming -- cores. With the forthcoming Samsung Exynos 5 Octa SoC, the big.LITTLE design is implemented as a 1.6~1.8GHz Cortex-A15 quad-core design while falling back to a 1.2GHz quad-core Cortex-A7 when wanting to conserve power and not needing to do much work. Kernel work on big.LITTLE has been ongoing for a while and now there's a mainline cpufreq driver for handling frequency switching.

Another big change is AMD's frequency sensitivity feedback power-save bias.

Other power management changes for the Linux 3.10 kernel include a Samsung Exynos 5440 cpufreq driver, cpufreq core clean-up, cpufreq scalability improvements, cpuidle improvements, and Intel Lynxpoint LPSS (Low-Power Subsystem) improvements.
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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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