https://bugs.freedesktop.org/show_bug.cgi?id=107939
Bug ID: 107939
Summary: Commit 888b7fc causes performance regression
Product: Mesa
Version: 18.1
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: da...@lunarg.com
QA Contact: dri-devel@lists.freedesktop.org
Our Vulkan regression test suite includes a Vulkan trace of the Sasha Willems
shadowmapping demo. We found that the fps when playing back that trace file had
decreased by about 20%. I narrowed down the performance drop to commit
888b7fc.
I duplicated the performance drop with the demo itself. Without commit 888b7fc,
the demo runs at an average of 3125 fps. With commit 888b7fc, it runs at 2675
fps. This is a performance regression of about 14%. I ran this on a system with
an Intel i5-6600K CPU @ 3.50GHz and an AMD Radeon RX470 graphics card.
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