1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking Benchmarking Platform
Phoromatic Test Orchestration

Linux 3.10 Gets New ARM, AMD Power Improvements

Linux Kernel

Published on 30 April 2013 10:19 AM EDT
Written by Michael Larabel in Linux Kernel
Comment On This Article

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.

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 .
Latest Articles & Reviews
  1. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  2. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  3. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  4. The Lenovo T450s Is Working Beautifully With Linux
  5. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  6. Linux 4.0 Hard Drive Comparison With Six File-Systems
Latest Linux News
  1. Debian-Based Distribution Updated With KDE 3.5 Forked Desktop
  2. Intel Is Making Some Progress With Compute Shaders
  3. Linux 4.1-rc1 Kernel Released, Packs In Several New Features
  4. It Doesn't Look Like KDBUS Will Make It For Linux 4.1
  5. Debian 9.0 Is Codenamed Stretch
  6. AMD Radeon GPUs With Linux 4.0 + Mesa 10.6-devel
  7. The Many Features Of The Linux 4.1 Kernel
  8. HTTPS For Phoronix.com
  9. Gallium3D's HUD Gets New Customization Options
  10. Intel Xeon E5-2620 v3 Haswell Performance
Most Viewed News This Week
  1. AMD Releases New "AMDGPU" Linux Kernel Driver & Mesa Support
  2. Ubuntu's Desktop-Next Switching From .DEBs To Snappy
  3. Systemd Kills Off Shutdownd
  4. My Favorite Computer Desk Of The Past Decade For Less Than $100
  5. AMD Open-Sources "Addrlib" From Catalyst
  6. Debian 8.0 Jessie Is Ready For Release This Weekend
  7. KDBUS Still Hasn't Been Pulled, Might Not Land For Linux 4.1
  8. GIMP's Porting To GTK3 Continues