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

GLAMOR'ized Radeon Driver Shows Hope Over EXA

AMD

Published on 03 October 2013 01:02 AM EDT
Written by Michael Larabel in AMD
45 Comments

While Intel has their highly-tuned "SNA" acceleration architecture for delivering maximum 2D performance, it turns out the OpenGL-based GLAMOR acceleration architecture for the open-source Radeon driver may be better than the xf86-video-ati driver's own EXA implementation.

This week we showed benchmarks done by Intel's Chris Wilson where SNA was beating UXA and GLAMOR (the two other 2D acceleration methods in the open-source Intel driver) by long shots for Cairo workloads. SNA is the very large and highly-tuned 2D code-path developed by Chris over the past two years that is finally becoming the default acceleration method in xf86-video-intel 3.0. The results shown this week indicated GLAMOR did much more poorly than SNA and UXA.

Chris, however, decided to do some benchmarks of the current xf86-video-ati driver state on his personal blog. With testing done from a Radeon HD 5770 "Evergreen" graphics card, Chris compared the open-source ATI/AMD Radeon driver performance to Intel SNA. It was found that the default EXA acceleration method for 2D in the Radeon driver was 2.9x slower than Intel SNA on Sandy Bridge while the GLAMOR option was only 2.0x slower.

GLAMOR in the Radeon driver is only required for Radeon HD 7000 series (RadeonSI) hardware and newer while it's an optional method for older GPUs (set via the AccelMethod in the xorg.conf). The Radeon driver has no highly-tuned 2D implementation, so even the generic OpenGL GLAMOR library can outperform its standard EXA code-paths. Interestingly, while GLAMOR was 2.0x slower than SNA, the fglrx driver and its 2D Cairo performance was 9.0x slower.

Chris Wilson ended his latest blog post with, "Or to put a positive spin on it, the new Glamor acceleration on this particular r600g device is about 50% faster than the existing EXA radeon driver. If you look closely there are just a couple of traces that EXA performs better than Glamor, with those regression fixed Glamor would be a clear improvement for radeon. And almost as fast as not using Glamor at all! However, Glamor was not able to complete the benchmark run without crashing."

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. Even With Re-Clocking, Nouveau Remains Behind NVIDIA's Proprietary Linux Driver
  2. The Power Consumption & Efficiency Of Open-Source GPU Drivers
  3. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  4. Intel Pentium G3258 On Linux
Latest Linux Articles
  1. AMD Catalyst 14.6 Does Slightly Better With APITest OpenGL Tests
  2. Updated Source Engine Benchmarks On The Latest AMD/NVIDIA Linux Drivers
  3. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  4. KVM Benchmarks On Ubuntu 14.10
Latest Linux News
  1. KDE 4.14 Release Candidate Ships
  2. Drivers & Drama Dominated Linux Talk In July
  3. Fedora Assembles A Security Team
  4. AMD Launches The A10-7800, The 65 Watt Kaveri
  5. Builder: A New Development IDE Being Built For GNOME
  6. GDB 7.8 Betters Python Scripting, Adds Guile Support
  7. GNOME's GTK+ Is Still Striving For A Scene Graph, Canvas API
  8. Unreal Tournament Looks Great For Team Deathmatch
  9. LibreOffice 4.3 Released With Many Exciting Changes
  10. GNOME/GTK On Wayland Gains Focus At GUADEC
Latest Forum Discussions
  1. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  2. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  3. Debian + radeonsi
  4. AMD Publishes Open-Source Linux HSA Kernel Driver
  5. Open-source drivers on ATI R7 260X
  6. AMD Athlon 5350 APU On Linux
  7. Updated and Optimized Ubuntu Free Graphics Drivers
  8. List of Linux friendly Kickstarter projects