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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 .
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