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

LLVMpipe May Be A Bit Closer To Running GNOME Shell

GNOME

Published on 23 May 2010 09:47 AM EDT
Written by Michael Larabel in GNOME
8 Comments

Last month we looked at the performance of the Gallium3D LLVMpipe driver that can provide software acceleration for the OpenGL-Mesa state tracker (among other state trackers via this driver architecture) on any modern CPU via LLVM (the Low-Level Virtual Machine) to optimize and handle these operations much more efficiently than the traditional Mesa software rasterizer.

The performance of LLVMpipe obviously was nowhere near the speed of using a proper GPU hardware driver with Gallium3D, but it was definitely a step-up from Mesa's software rasterizer that is simply unusable crap. Some games were close to being playable using LLVMpipe atop a very fast, multi-core CPU thanks to the geometry pipeline and other additions to this software driver.

While LLVMpipe is able to run OpenGL games, we then tested to see if LLVMpipe could run the GNOME Shell or Compiz, which need OpenGL but are not nearly as taxing on the graphics as a normal game. If LLVMpipe could efficiently handle running GNOME Shell it would mean a lot for providing a better "out of the box" experience for systems where there is no open-source 3D driver available by default with the GNOME 3.0 desktop. However, Compiz nor the GNOME Shell had worked with LLVMpipe at that time.

The problem was largely attributed to the software rasterizer / LLVMpipe lacking support for the GLX_EXT_texture_from_pixmap extension. This was the extension that was needed with the original Compiz upbringing and it took a while for ATI to drive that support in their Catalyst / fglrx Linux driver but now that texture from pixmap extension can be found in pretty much every open- and closed-source Linux graphics driver.

Fortunately, Red Hat's David Airlie has now created a patch that adds the texture from pixmap (TFP) support to Mesa's software rasterizer (the "swrast" driver). The patch was published this morning on the mesa-dev mailing list. David mentions with this patch he can "run gnome-shell inside Xephyr slowly. I've no idea why I did it, and g-s has other rendering issues under swrast, but it might be useful to hook up llvmpipe later. I've no idea if I even want to commit it at this point."

This patch is just a couple dozen lines of code and obviously isn't really beneficial quite yet but will hopefully be once hooked into LLVMpipe and the other GNOME Shell issues are addressed.

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. 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. Fedora 21 Has Been Delayed By Three Weeks
  2. Mono Begins To Focus On Performance, Assembles A Team
  3. Oracle Linux 7 Released Today As Its RHEL7 Clone
  4. Unigine Develops City Traffic System, A Driving Simulator
  5. Intel 3.0 X.Org Driver Still Baking, New Development Release
  6. Eric Anholt Makes Progress With Broadcom VC4 Graphics Driver
  7. Intel Is Getting Very Close To OpenGL 4.0/4.1/4.2 Mesa Support
  8. Valve Is Still Hiring For SteamOS, Linux Work
  9. Users Warned About Possible Regressions With DRI3
  10. GNOME Shell Gets Wayland HiDPI Fonts, Mutter Gets Touch Gestures
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Radeon related kernel bug??
  3. AMD Publishes Open-Source Linux HSA Kernel Driver
  4. Next-Gen OpenGL To Be Announced Next Month
  5. Open-Source Radeon Performance Boosted By Linux 3.16
  6. Remote gui not accessible in Phoronix Test Suite 5.2
  7. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  8. In Road To Qt, Audacious Switches From GTK3 Back To GTK2