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R600 Gallium3D Patch Boosts Unigine By ~30%

AMD

Published on 18 February 2013 02:54 AM EST
Written by Michael Larabel in AMD
29 Comments

A rather simple patch by Vadim Girlin has led to a reported significant performance improvement within the R600 Gallium3D graphics driver.

Last week Vadim revived his shader optimizations branch of R600g. The consensus among the open-source AMD developers were that the work is interesting but the R600 LLVM back-end is the future and what they're investing in, however, Vadim's work was an interesting experiment and he may have gained some valuable knowledge out of this shader optimization back-end work.

While that work likely won't be merged, on Sunday night Vadim posted an interesting patch for the current R600g driver implementation. Due to over-cautious stack reservation, there's a "significant loss of performance" says Vadim. His simple one-liner patch sees that the driver doesn't reserve more stack space than actually required.

Vadim's patch description notes that this simple patch "adds more than 30% FPS for Unigine Heaven." He's been testing this from a Radeon HD 5000 "Evergreen" series graphics card and doesn't see any regressions. Unfortunately there's only the noted performance improvement for Unigine Heaven and not any of the other Linux OpenGL demos.

This current performance optimization patch is currently floating on the mesa-dev list.

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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