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

AMD Works On Linux Power Savings For Future CPUs

AMD

Published on 28 March 2013 10:57 AM EDT
Written by Michael Larabel in AMD
23 Comments

New kernel patches by AMD for the Linux kernel provide "frequency sensitivity feedback" for the powersave bias in cpufreq. This hardware feedback feature is to be introduced on future AMD processors.

This patch-set allows the system to make more power conscious frequency changing decisions based upon hardware feedback. The hardware bits are to be found on "AMD Family 16h" processors and above, which is the forthcoming AMD "Jaguar" product. AMD provided the original Linux kernel support for "Family 16h" at the end of 2012.

Jacob Shin of AMD explains this new power-saving capability, "Hardware feedback tells software how 'sensitive' to frequency changes the workloads are. CPU-bound workloads will be more sensitive -- they will perform better as frequency increases. Memory/IO-bound workloads will be less sensitive -- they will not necessarily perform better as frequency increases. This patchset was compared against ondemand governor without powersave bias and did not show any performance degradation on CPU-bound workloads such as kernbench and unixbench. While saving power on Memory-bound workloads such as stream."

This AMD-specific powersave bias will likely be merged into the Linux 3.10 kernel. The patch series can be found on the kernel mailing list. Too bad AMD doesn't have any Radeon graphics power management improvements for their open-source driver.

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 Linux News
  1. AMD Teases Upcoming Radeon "Fiji" GPU Launch
  2. Dell Makes An Ubuntu Installation Guide, Suggests Users Try It Out
  3. Running Linux On The Intel Compute Stick
  4. AMD Launches The A10-7870K "Godavari" APU
  5. Linux 4.1 Kernel Benchmarks With An Intel Core i7 IVB System
  6. Genode OS 15.05 Brings New Drivers, Architecture Improvements
  7. Debian 8.1 Jessie Is Being Released Next Weekend
  8. At Least Two Ubuntu Phone Announcements Expected In June
  9. Russia's Baikal Chips End Up Going For A MIPS CPU
  10. Mesa Git OpenGL Tests With Intel Ivy Bridge Graphics
Latest Articles & Reviews
  1. Opening The Gates To Our Daily Open-Source Linux Benchmark Results
  2. The Latest Features For Linux Performance Management + Benchmark Monitoring
  3. Noctua NH-U12DX i4 + NF-F12
  4. Btrfs RAID 0/1 Benchmarks On The Linux 4.1 Kernel
Most Viewed News This Week
  1. The Linux 4.0 EXT4 RAID Corruption Bug Has Been Uncovered
  2. NVIDIA's Proprietary Driver Is Moving Closer With Kernel Mode-Setting
  3. Systemd 220 Has Finally Been Released
  4. Zapcc Claims To Be A "Much Faster C++ Compiler"
  5. LibreOffice 5.0 Beta 1 Released
  6. OpenWRT 15.05 Preparing Improved Security & Better Networking
  7. Ubuntu's LXD vs. KVM For The Linux Cloud
  8. Features Added To Mesa 10.6 For Open-Source GPU Drivers