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Intel's Mesa Driver Gets A Small Performance Boost

Intel

Published on 28 January 2013 07:42 PM EST
Written by Michael Larabel in Intel
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Another patch landed in mainline Mesa today that's capable of providing a small performance boost for some OpenGL workloads with Intel's open-source Linux graphics driver.

Eric Anholt worked on today's performance-enhancing patch, entitled intel: Use a CPU map of the batch on LLC-sharing architectures. The commit description explains, "Before, we were keeping a CPU-only buffer to accumulate the batchbuffer in, which was an improvement over mapping the batch through the GTT directly (since any readback or other failure to stream through write combining correctly would hurt). However, on LLC-sharing architectures we can do better by mapping the batch directly, which reduces the cache footprint of the application since we no longer have this extra copy of a batchbuffer around."

Eric went on to note that this patch, which changes less than three dozen lines of code, improves the performance of GLBenchmark, Lightsmark, and Cairo-GL by a couple percent when running on Ivy Bridge hardware. However, overall this won't affect Intel's Mesa OpenGL performance too very much.

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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