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

Here's Why Radeon Graphics Are Faster On Linux 3.12

Michael Larabel

Published on 15 October 2013
Written by Michael Larabel
Page 3 of 5 - 108 Comments

Once finding the root cause of the problem, I took it one step further to better welcome and thank the new Phoronix Premium subscribers and those who contributed yesterday for the Radeon testing. The Phoronix Test Suite also has a built-in system-monitoring module to be able to simultaneously monitor various hardware and software sensors as benchmarks are taking place... The supported sensors range from the CPU temperature to disk write speeds to network sensors, but also the real-time CPU frequency and CPU usage. Taking advantage of the support in this case just requires setting MONITOR=cpu.freq,cpu.usage as an environment variable prior to running any Phoronix Test Suite benchmarks (to see all available sensors, run phoronix-test-suite system-sensors; note on Ubuntu 13.10 they removed PHP5 PCNTL support unexpectedly so you may need to rebuild PHP manually for the multi-threaded system sensor monitoring support).

In having the Phoronix Test Suite monitor the CPU frequency and usage in real-time while the different OpenGL benchmarks were happening, we were able to get a better idea for how the CPUfreq ondemand governor is behaving differently between the Linux 3.11 and Linux 3.12 Git kernels. Testing was done on an Intel Core i7 4770K "Haswell" system and the graphics card for this system monitoring session was the AMD Radeon HD 6950. System details, logs, and other information can be found within 1310143-SO-LINUX312R98.

For OpenArena 0.8.8 between 3.11 and 3.12 Git, the Radeon HD 6950 on the open-source driver with Mesa 10.0-devel R600 Gallium3D was 14% faster by just upgrading the kernel.

The Phoronix Test Suite's system monitor module was polling the CPU frequency once per second and it's clearly showing a difference between the Linux 3.11 and 3.12 kernels. With the Linux 3.11 kernel, this CPU-limited game was staying mostly at its lowest 800MHz stepping most of the time and quite often then bumping up to 3.5GHz. With the Linux 3.12 kernel for the entire duration of the testing the CPU frequency was just going between its 3.5GHz highest base frequency and 3.9GHz Turbo frequency and never dropping down to its lowest 800MHz state. When running the game, the CPU governor isn't letting the CPU slowdown. This is good for performance and we'll see in some benchmarks shortly how this impacts the power consumption while gaming on Linux.

The CPU frequency staying in its highest states during all of the OpenArena testing, the average CPU frequency as a percent was then lower with the Linux 3.12 kernel.

Latest Linux Hardware Reviews
  1. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  2. Intel Pentium G3258 On Linux
  3. SilverStone Precision PS10
  4. ASRock Z97 Extreme6
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. Linux Developers Jump Quickly On ACPI 5.1, Helps Out ARM
  2. Pkg 1.3.0 Released To Improve Package Management On FreeBSD
  3. GOG.com Officially Starts Rolling Out Linux Games
  4. Fedora 21 Has Been Delayed By Three Weeks
  5. Mono Begins To Focus On Performance, Assembles A Team
  6. Oracle Linux 7 Released Today As Its RHEL7 Clone
  7. Unigine Develops City Traffic System, A Driving Simulator
  8. Intel 3.0 X.Org Driver Still Baking, New Development Release
  9. Eric Anholt Makes Progress With Broadcom VC4 Graphics Driver
  10. Intel Is Getting Very Close To OpenGL 4.0/4.1/4.2 Mesa Support
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Radeon related kernel bug??
  3. how the US intellegentia operates:
  4. AMD Publishes Open-Source Linux HSA Kernel Driver
  5. Next-Gen OpenGL To Be Announced Next Month
  6. Open-Source Radeon Performance Boosted By Linux 3.16
  7. Remote gui not accessible in Phoronix Test Suite 5.2
  8. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right