RadeonSI OoO Rasterization Lands In Mesa 17.3 For RX Vega & VI GPUs
Written by Michael Larabel in Mesa on 18 September 2017 at 06:26 AM EDT. 13 Comments
MESA --
The RadeonSI out-of-order rasterization support for RX Vega "GFX9" and Volcanic Islands GPUs has now landed in Mesa 17.3-devel Git.

The out-of-order rasterization support should be able to boost the performance of these newer graphics cards in some Linux games. The support is enabled by default for now on Vega/VI GPUs while can be disabled with R600_DEBUG=nooutoforder.

No performance data has been supplied by the AMD developers, but it's expected to be of small benefit. There's also in Git now the radeonsi_assume_no_z_fights=true switch too that can be enabled manually -- it's not on by default as it slightly breaks OpenGL invariance guarantees. But that switch is expected to provide a minor performance benefit too in some games.

These latest performance-focused patches for the RadeonSI OpenGL driver can be found in Mesa Git. I'll likely have some fresh benchmarks up later in the week.
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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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