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

Previewing The Radeon DPM Performance On Linux 3.11

Michael Larabel

Published on 16 July 2013
Written by Michael Larabel
Page 1 of 4 - 28 Comments

As promised, now that Linux 3.11-rc1 has been released, it's time for the new dynamic power management support of the Linux 3.11 kernel for AMD Radeon graphics. This first article previews the possible OpenGL performance gains for an AMD APU when enabling "DPM" for allowing the graphics core to properly re-clock based upon its workload.

Setting up the Radeon dynamic power management support is simply a matter of getting a Linux 3.11+ kernel (for Ubuntu users, there is the Ubuntu mainline kernel PPA with daily packages as well as the release candidates), fetching the latest AMD microcode files, and then passing "radeon.dpm=1" as a kernel module parameter. Linux 3.11 by default isn't enabling the Radeon dynamic power management so sufficient testing can occur and it will then be enabled by default in a later update. Via the kernel dmesg and sysfs/debugfs entries you can verify whether the Radeon DPM functionality is in use.

Radeon dynamic power management is a big win for mobile/laptop users where battery life is important and for higher-end Radeon GPUs that can be quite power hungry. Now when the GPU isn't enduring high load, the GPU core and memory frequencies can drop to lower power states that also reduce the voltage, while then clocking back higher when encountering any 3D/OpenGL workloads. The dynamic power management support is also important since for AMD APUs and higher-end modern GPUs the default boot clock speeds can be lower than their factory-rated frequencies, which up until now weren't forced by the Radeon DRM by default when encountering 3D load. Now Radeon DRM users can maximize the full potential of their graphics hardware.

In this article are some Linux 3.11-rc1 benchmarks of an AMD A10-6800K "Richland" APU with Radeon HD 8670D graphics. The Linux 3.11 testing was done with and without the "radeon.dpm=1" power management support. Testing also happened from a vanilla Linux 3.10 kernel with its stock settings. Mesa 9.2-devel was in use with the R600 Gallium3D driver atop this modified Ubuntu 13.10 installation. All benchmarking was handled in a fully automated and streamlined parameter using the open-source Phoronix Test Suite software.

<< Previous Page
1
Latest Linux Hardware Reviews
  1. Overclocking The AMD AM1 Athlon & Sempron APUs
  2. AMD Athlon 5350 / 5150 & Sempron 3850 / 2650
  3. Upgraded Kernel & Mesa Yield A Big Boost For Athlon R3 Graphics
  4. AMD Athlon 5350 APU On Linux
Latest Linux Articles
  1. A Quick Look At GCC 4.9 vs. LLVM Clang 3.5
  2. Are AMD Athlon/Sempron APUs Fast Enough For Steam On Linux?
  3. AMD Athlon's R3 Graphics: RadeonSI Gallium3D vs. Catalyst
  4. GCC 4.9 Compiler Optimization Benchmarks For Faster Binaries
Latest Linux News
  1. Maynard: A Lightweight Wayland Desktop
  2. Chromium Browser Going Through Growing Pains In Ubuntu 14.04
  3. KDE 4.13 Is Being Released Today With New Features
  4. Trying Out Radeon R9 290 Graphics On Open-Source
  5. Intel Broadwell GT3 Graphics Have Dual BSD Rings
  6. Early Linux 3.15 Benchmarks Of Intel Core i7 + Radeon
  7. Red Hat Releases Its RHEL 7 Release Candidate
  8. New Features Coming To Xubuntu 14.04 LTS
  9. NVIDIA Officially Releases CUDA 6
  10. Google Releases An AutoFDO Converter For Perf In LLVM
  11. Fedora 21 To Evaluate Remote Journal Logging, 64-bit ARM Emulation
  12. Star Citizen Will Be Coming To Linux
Latest Forum Discussions
  1. The GNOME Foundation Is Running Short On Money
  2. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  3. Bye bye BSD, Hello Linux: A Sys Admin's Story
  4. New tool for undervolt/overclock AMD K8L and K10 processors
  5. How to enable opengl 3.3 on r9 270?
  6. R290x sound problems
  7. radeon-profile: tool for changing profiles and monitoring some GPU parameters
  8. Torvalds Is Unconvinced By LTO'ing A Linux Kernel