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. Rosewill RS-MI-01: An Ultra Low-Cost Mini-ITX Chassis
  2. D-Link DCS-2330L HD Wireless Network Camera
  3. Gigabyte AM1M-S2H
  4. AMD's New Athlon/Semprons Give Old Phenom CPUs A Big Run For The Money
Latest Linux Articles
  1. AMD Catalyst 14.4 On Linux With Radeon R3 APU Graphics
  2. Red Hat Enterprise Linux 7.0 RC Benchmarks
  3. AMD Catalyst 14.4 Brings Few Linux Performance Improvements
  4. The Performance Of Fedora 20 Updated
Latest Linux News
  1. R600 Gallium3D Lands Many OpenGL Fixes
  2. LLVMpipe Gallium3D Now Exposes GLSL 3.30
  3. NGINX 1.6 Brings SPDY 3.1 & Other New Features
  4. Linux Foundation Announces A Core Infrastructure Initiative
  5. More Steam Linux Tests/Benchmarks Might Be Coming
  6. NVIDIA's Amazing Single-Board ARM Computer Might Be Delayed
  7. Fedora 21 To Get A Playground, New Features
  8. PC-BSD Is Developing Its Own Desktop Environment
  9. Valve Is Bringing VOGL To Windows & Working On Regression Tests
  10. Canonical Is Taking Over Linux 3.13 Kernel Maintenance
  11. Google Web Designer Is Now Natively Available On Linux
  12. Ubuntu 14.10 Is Codenamed The Utopic Unicorn
Latest Forum Discussions
  1. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  2. HTPC-upgrade advice: AMD Richland A8-7600 or Kaveri A10-6700T ???
  3. What Else Would You Like To See On Phoronix This Spring?
  4. The GNOME Foundation Is Running Short On Money
  5. The Most Amazing OpenGL Tech Demo In 64kb
  6. Announcing radeontop, a tool for viewing the GPU usage
  7. New card. Open source drivers only.
  8. Script for Fan Speed Control