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Reworking The R600 Gallium3D Driver Winsys Back-End

AMD

Published on 08 August 2011 08:16 AM EDT
Written by Michael Larabel in AMD
6 Comments

Marek Olšák, one of the most prolific open-source graphics driver developers that isn't backed by any corporation, has made another major improvement to the open-source ATI/AMD "R600" Gallium3D driver. This student developer has reworked the Radeon winsys back-end, which can cause major performance improvements.

Marek has been working on thread off-loading of the CS ioctl in the R600g driver in order to reduce kernel overhead. Marek expects this thread off-loading of the DRM command submission ioctl to cause up to a 15% performance increase for CPU-bound games/applications. The R600g code now also supports the new GEM_WAIT ioctl and also has greater thread-safety to prevent possible race conditions in the driver. There's also support for space checking, but the R600g driver isn't using that yet.

Two OpenGL games that are having noticeable performance improvements are Unigine Heaven and TORCS, according to Marek. His new "r600winsys2" branch is also not resulting in any new Piglit regressions. For now this new Radeon winsys is living in the Mesa branch, but it should be merged to master soon (certainly in time for Mesa 7.12).

More details can be found in Marek's mailing list announcement.

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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