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

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.

Latest Linux News
  1. Mesa 10.5.6 Brings Fixes All Over The Place
  2. NVIDIA's Proprietary Driver Is Moving Closer With Kernel Mode-Setting
  3. The Latest Linux Kernel Git Code Fixes The EXT4 RAID0 Corruption Problem
  4. Features Added To Mesa 10.6 For Open-Source GPU Drivers
  5. Ubuntu's LXD vs. KVM For The Linux Cloud
  6. Fedora Server 22 Benchmarks With XFS & The Linux 4.0 Kernel
  7. GCC 6 Gets Support For The IBM z13 Mainframe Server
  8. Fedora 22 Is Being Released Next Tuesday
  9. OpenWRT 15.05 Preparing Improved Security & Better Networking
  10. Using The New LLVM/Clang OpenMP Support
Latest Articles & Reviews
  1. Btrfs RAID 0/1 Benchmarks On The Linux 4.1 Kernel
  2. The State Of Various Firefox Features
  3. Intel Iris Graphics Performance With Mesa 10.6
  4. Fedora Workstation 22 Is Looking Great, Running Fantastic
Most Viewed News This Week
  1. The Linux 4.0 Kernel Currently Has An EXT4 Corruption Issue
  2. The Linux 4.0 EXT4 RAID Corruption Bug Has Been Uncovered
  3. AMDGPU Open-Source Driver Code Continues Maturing
  4. Microsoft Open-Sources The Windows Communication Foundation
  5. Another HTTPS Vulnerability Rattles The Internet
  6. LibreOffice 5.0 Open-Source Office Suite Has Been Branched
  7. Systemd 220 Has Finally Been Released
  8. Will Ubuntu Linux Hit 200 Million Users This Year?