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. MSI X99S SLI PLUS On Linux
  2. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  3. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  4. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
Latest Linux Articles
  1. RunAbove: A POWER8 Compute Cloud With Offerings Up To 176 Threads
  2. 6-Way Ubuntu 14.10 Linux Desktop Benchmarks
  3. Ubuntu 14.10 XMir System Compositor Benchmarks
  4. Btrfs RAID HDD Testing On Ubuntu Linux 14.10
Latest Linux News
  1. Fedora 21 Beta & Final Release Slip Further
  2. Mesa 10.3.2 Has A Couple Bug-Fixes
  3. RadeonSI/R600g HyperZ Support Gets Turned Back On
  4. openSUSE Factory & Tumbleweed Are Merging
  5. More Fedora Delays: Fedora 21 Beta Slips
  6. Mono Brings C# To The Unreal Engine 4
  7. Coreboot Now Has Support For Intel Broadwell Hardware
  8. Enlightenment's EFL 1.12 Alpha Has Evas GL-DRM Engine, OpenGL ES 1.1 Support
  9. GTK+ Lands Experimental Backend For Mir Display Server
  10. Ubuntu 14.10 Officially Released
Latest Forum Discussions
  1. AMD Radeon VDPAU Video Performance With Gallium3D
  2. HOPE: The Ease Of Python With The Speed Of C++
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  5. Linux hacker compares Solaris kernel code:
  6. Advertisements On Phoronix
  7. Users/Developers Threatening Fork Of Debian GNU/Linux
  8. AMD Releases UVD Video Decode Support For R600 GPUs