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.org

Testing Radeon DPM Using Sysfs/Debugfs

AMD

Published on 06 July 2013 03:37 PM EDT
Written by Michael Larabel in AMD
2 Comments

For those looking to test out the long-awaited Radeon dynamic power management support within the Linux 3.11 kernel, here's some information on the new debugfs and sysfs interfaces for dealing with this "DPM" feature.

The Radeon updates for the Linux 3.11 kernel are very exciting as the GPU clock speeds and voltages can dynamically adjust based upon load. This leads to power-savings when idling, especially for battery-backed systems, and also to greater performance on newer hardware by being able to up-clock the GPU from its boot speeds. In this next kernel release there is also Radeon HD 8000 "Sea Islands" open-source GPU support in early form.

The dynamic power management support has already seen code revisions and bug-fixes prior to merging to mainline. With these revisions have come new debugfs/sysfs entries for dealing with the dynamic power management levels.

For those looking for descriptions on these new sysfs and debugfs entries for monitoring and toggling dynamic power management states, AMD's Alex Deucher has written a new blog post that describes these new tunable options.

As a reminder, with the Linux 3.11 kernel the DPM support is disabled by default and the kernel must be booted with the radeon.dpm=1 kernel module parameter. Once the DPM support is well-tested and proven to be reliable, it will be enabled by default.

For those seeking additional information on Radeon DPM within this open-source Linux driver, AMD's Alex Deucher and John Bridgman have been answering Phoronix reader questions within this forum thread, among other Phoronix threads.

As soon as Linux 3.11-rc1 is out there with this support, Radeon DPM benchmarks will begin at Phoronix.

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 Hardware Reviews
  1. Intel Pentium G3258 On Linux
  2. SilverStone Precision PS10
  3. ASRock Z97 Extreme6
  4. Nouveau Re-Clocking Is Way Faster, Shows Much Progress For Open-Source NVIDIA
Latest Linux Articles
  1. KVM Benchmarks On Ubuntu 14.10
  2. X.Org Server 1.16 Officially Released With Terrific Features
  3. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
  4. Preview: Benchmarking CentOS 7.0 & Scientific Linux 7.0
Latest Linux News
  1. The Linux Kernel Bang-Bang Thermal Governor Is Banging
  2. NVIDIA Releases K1-Powered Shield Tablet & Controller
  3. Xen Project Announces Mirage OS 2.0
  4. Canonical Community Team Changes Announced For Ubuntu
  5. Raspberry Pi B+ ARM Debian Benchmarks
  6. Mozilla Unleashes Firefox 31 Web Browser
  7. GCC 5.0 Is Expected Next Year
  8. PHP5's Successor Might Be PHP7
  9. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  10. AMDKFD Driver Still Evolving For Open-Source HSA On Linux
Latest Forum Discussions
  1. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  2. Next-Gen OpenGL To Be Announced Next Month
  3. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. AMD Publishes Open-Source Linux HSA Kernel Driver
  6. KDE Plasma 5 Officially Released
  7. Vote For GOG To Make Galaxy Open Source
  8. TSC Problem on Gigabyte GA-X79-UP4 (rev 1.1)