RadeonSI Primitive Culling Yields Mixed Benchmark Results


Yesterday's patches introducing RadeonSI primitive culling via async compute yielded promising initial results, at least for the ParaView workstation application. I've been running some tests of this new functionality since yesterday and have some initial results to share on Polaris and Vega.
I've been running tests using a Radeon RX 590 and RX Vega 64 graphics cards. Tests were run with the latest Mesa Git branch of Marek's that provides this primitive culling implementation. That Mesa version was built against LLVM 9.0 SVN, which is a requirement otherwise the very latest LLVM 8.0 release state otherwise this functionality will not work. Additionally, it depends upon the AMDGPU DRM-Next material in the kernel as well so I was running a fresh kernel build off Alex Deucher's latest code branch.
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