RadeonSI Gallium3D Driver Adds Navi Wave32 Support
Written by Michael Larabel in Radeon on 20 July 2019 at 07:19 AM EDT. 38 Comments
RADEON --
One of the new features to the RDNA architecture with Navi is support for single cycle issue Wave32 execution on SIMD32. Up to now the RadeonSI code was using just Wave64 but now there is support in this AMD open-source Linux OpenGL driver for Wave32.

Well known AMD open-source developer Marek Olšák landed this Wave32 support on Friday for the RadeonSI driver. The Wave32 support landed over several commits to Mesa 19.2-devel and is enabled for vertex, geometry, and tessellation shaders. Wave32 isn't enabled for pixel shaders but rather Wave64. Additionally, Wave32 isn't yet enabled for compute shaders due to Piglit OpenGL test case failures.

This Wave32 support though should help the performance at least for the shaders where it's turned on.

In addition to the Wave32 Navi support landing in RadeonSI, there was also ARB_post_depth_coverage for GFX10/Navi turned on, SDMA support is now enabled, and other Navi bits that reached Mesa 19.2 Git on Friday.

I'll have out new Radeon RX 5700/5700XT benchmarks next week now that the Linux open-source driver support for these new AMD graphics processors is stabilizing quite well just a few weeks after launch.

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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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