[Bug 109582] Performance regressions in Mesa 19.0.0-rc2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109582

            Bug ID: 109582
           Summary: Performance regressions in Mesa 19.0.0-rc2
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: johnz at lunarg.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

--Mesa Version--
mesa-19.0.0-rc1 or mesa-19.0.0rc2

--Hardware--
Intel Skylake Processor

--Description--
There seems to be about a -50% performance regression for Sascha Willems demo's
"Compute Shader" and "Compute Particles".

Also, a replay of a trace of dota2 also is experiencing a regression of about
-50% in performance. 

These regressions are not seen in the Mesa 18.3 branch.

See https://share.lunarg.com/vulkan/report/2957#performance for reference.

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