By Luck, Marek Discovers A "Serious Performance Fix" For RadeonSI
Written by Michael Larabel in Radeon on 12 October 2016 at 05:47 PM EDT. 44 Comments
RADEON --
Marek Olšák, the prolific longtime contributor to Mesa and AMD developer, published a patch today with a big performance improvement that he says has been discovered by luck.

Hitting the Mesa mailing list this afternoon was a RadeonSI patch to disable ReZ. His comment was simply, "This is a serious performance fix. Discovered by luck."

In the patch a code comment he added warns, "DON'T USE EARLY_Z_THEN_RE_Z !!!" He found this code caused a performance decrease of 15% with DiRT Showdown on ultra quality settings.

By deleting this case of using EARLY_Z_THEN_RE_Z, this small patch allows for better performance. This should also help other Linux games on RadeonSI making use of complex shaders.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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