[Bug 107939] Commit 888b7fc causes performance regression

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: david at lunarg.com
        QA Contact: dri-devel at 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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