Trying The RADV Vulkan Driver With SISCHED
Written by Michael Larabel in Radeon on 11 July 2017 at 11:44 AM EDT. Add A Comment
Last week the RADV Radeon Vulkan driver added an option to enable SISCHED, the LLVM SI Machine Instruction Scheduler that for a while has been a non-default option for the RadeonSI Gallium3D driver.

This "sisched" option for the AMDGPU LLVM back-end is now available for the RADV driver. With Mesa 17.2-dev Git to enable the support, the R600_DEBUG=sisched environment variable can be set otherwise it's off by default.

I ran a few benchmarks today with Mesa 17.2-dev Git to see the impact with RADV on a Radeon RX 580 card.

Dawn of War III was slower with sisched enabled.

But Mad Max with Vulkan appeared to benefit slightly.

Other Vulkan tests hadn't revealed any real change. Testing now on some other hardware.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 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 automated benchmarking software. He can be followed via Twitter or contacted via

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