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

ATI Radeon CrossFire On Linux

Michael Larabel

Published on 20 August 2008
Written by Michael Larabel
Page 2 of 10 - 18 Comments

For NVIDIA SLI on Linux it's just a matter of specifying the SLI mode to use (Auto, SLI, AFR, AA, or AFRofAA) using the nvidia-xconfig utility or manually writing the option to the xorg.conf. Once that has been done and X restarted, Scalable Link Interface will be used where applicable. Through nvidia-settings, the SLI HUD (Heads-Up Display) can be enabled to visually show the rendering workload split between the NVIDIA GPUs. However, for most OpenGL programs the following string must be set before launching the program "__GL_DOOM3=1", otherwise SLI will not be enabled if the __GL_DOOM3 variable is not set.

On the ATI side, right now the setup is not as simple, but using CrossFire is straightforward. As of the Catalyst 8.8 Linux driver (fglrx 8.52), CrossFire is only supported on the Radeon HD 4850, Radeon HD 4870, and Radeon HD 4870 X2 graphics cards. Another caveat is that right now only two GPUs are supported by CrossFire on Linux. The four-card support may or may not come in the near future depending upon consumer feedback. The mix-and-match aspect of CrossFireX is supported on Linux to run say a Radeon HD 4850 and Radeon HD 4870 in a CrossFire configuration, but we have been told that it's not well tested at this time.

After you have installed the Catalyst 8.8 driver on a system that meets the criteria for CrossFire usage, the feature can then be enabled. The first step in the process is to create a CrossFire chain. A CrossFire chain consists of specifying the master graphics card and then the slave adapters. Right now with only two GPUs being supported, there is just the support for one master and one slave. To add a CrossFire chain, run aticonfig --adapter=0,1 --cfa where 0 would be the master graphics card and 1 would be the slave. To find out the order of the graphics cards, run aticonfig --lscc to see all ATI graphics cards capable of running CrossFire. If all went well, the CrossFire chain will have been created and its configuration written to the AMDPCSDB, or the AMD Persistent Configuration Store Data-Base.

Latest Linux Hardware Reviews
  1. Preview: AMD's FX-9590 Eight-Core At Up To 5.0GHz On Linux
  2. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  3. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  4. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
Latest Linux Articles
  1. Ondemand vs. Performance CPU Governing For AMD FX CPUs On Linux 3.17
  2. How Intel Graphics On Linux Compare To Open-Source AMD/NVIDIA Drivers
  3. The Fastest NVIDIA GPUs For Open-Source Nouveau With Steam Linux Gaming
  4. Testing For The Latest Linux Kernel Power Regression
Latest Linux News
  1. Marek Lands Radeon Gallium3D HyperZ Improvements
  2. Mozilla Firefox 32 Surfaces With HTML5, Developer Changes
  3. Nouveau X.Org Driver Released With DRI3+Present, Maxwell, GLAMOR
  4. Microsoft & AMD Release C++ AMP Compiler With Linux Support
  5. AMD, Wine & Valve Dominated August For Linux Users
  6. Linux 3.17-rc3 Kernel Released Back On Schedule
  7. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  8. Mesa 10.3 RC2 Arrives Via Its New Release Manager
  9. Ubuntu 14.10's Lack Of X.Org Server 1.16 Gets Blamed On AMD
  10. MSI Motherboard BIOS Updating Remains A Pain For Linux Users
Latest Forum Discussions
  1. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  2. Best Radeon for a Power Mac G5?
  3. The dangers of Linux kernel development
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. AMD Releases UVD Video Decode Support For R600 GPUs
  6. SSD seems slow
  7. Is laptop with Intel CPU and AMD dGPU worth buying considering especially AMD Enduro?
  8. Radeon HD5670 and Ubuntu 14.04