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

R600g Driver Patch That Can 4x The Frame-Rate

Mesa

Published on 31 October 2012 09:32 PM EDT
Written by Michael Larabel in Mesa
40 Comments

Following yesterday's article comparing the AMD Radeon Linux drivers on Ubuntu 12.10, Marek Olšák looked into some of the cases where the open-source Radeon Gallium3D driver was much slower than the proprietary Catalyst driver. Already with one patch that touches only two dozen lines of code, Marek was able to quadruple the open-source driver frame-rate for at least one game.

By forcing some buffers to use the video RAM rather than the GART/GTT system memory, Marek managed the 4x OpenGL performance increase on the R600g driver for the Reaction Quake 3 game.

The patch surfaced today on the Mesa mailing list. "The problem was we set VRAM|GTT for relocations of STATIC resources. Setting just VRAM increases the framerate 4 times on my machine."

For those wondering about other possible performance optimizations for the open-source Mesa/Gallium3D drivers, Alex Deucher of AMD wrote in the forums that better heuristics for better buffer placement and buffer upload/caching can be a win as well as shader compiler improvements, cached and uncached GART memory usage, and better 1D/2D/linear tiling selection heuristics.

Among the missing OpenGL features for Radeon HD 2000 through HD 4000 graphics cards at the moment include geometry shaders, multi-sample textures, uniform buffer objects, and texture buffer objects, wrote Marek in another post.

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. 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. The Performance Of Fedora 20 Updated
  2. Clang Fights GCC On AMD's Athlon AM1 APU With Jaguar Cores
  3. Ubuntu 14.04 LTS vs. Oracle Linux vs. CentOS vs. openSUSE
  4. How Much Video RAM Is Needed For Catalyst R3 Graphics?
Latest Linux News
  1. Red Hat Enterprise Linux 7.0 Is Looking Fantastic
  2. Intel Is Launching An Interesting Bay Trail NUC Next Week
  3. Another X.Org EVoC Proposed For OpenGL 4+ Tests
  4. The Best Features Coming With Qt 5.3
  5. Red Hat's RHEL7 RC ISO Is Now Publicly Available
  6. Nuclear Dawn Seems To Run Fine On AMD Linux
  7. KDE 4.14 Release Schedule Published
  8. GCC 4.9.0 Released, Brings Many Compiler Features
  9. OpenSSL Forked By OpenBSD Into LibreSSL
  10. GNOME Has Big Plans For Its Maps Application
  11. NVIDIA Will Soon Probably Introduce OpenCL 1.2 Linux Support
  12. Google Is Financing A Lot Of Great Open-Source Work This Summer
Latest Forum Discussions
  1. New card. Open source drivers only.
  2. Announcing radeontop, a tool for viewing the GPU usage
  3. The GNOME Foundation Is Running Short On Money
  4. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  5. The Most Amazing OpenGL Tech Demo In 64kb
  6. Script for Fan Speed Control
  7. Torvalds Is Unconvinced By LTO'ing A Linux Kernel
  8. ReactOS Working On A Community Windows OS