Radeon Vulkan Variable Rate Shading Benchmarks For Boosting RDNA2 Performance
Landing in Mesa 21.1 on Friday was a variable rate shading (VRS) override for the Radeon Vulkan "RADV" driver for providing significant performance boosts by effectively rendering less. This feature is limited to RDNA2 graphics processors while here are some benchmarks on what it means for 4K gaming with the AMD Radeon RX 6000 series graphics cards on Linux.
The Mesa RADV driver has Variable Rate Shading (VRS) support for trading less rendering for higher performance. The driver allows setting an environment variable (RADV_FORCE_VRS) to force-enable the functionality even for games/software not making direct use of Vulkan VRS. A value of 2x2 will reduce the fragment shader invocations per pixel to one per 2x2 pixels as a decent performance boost while not degrading quality too much. For the benchmarking today I tested the RDNA2 graphics cards available with the 2x2 setting compared to no overrides.
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