[Bug 110029] [GEN8+] 1-2% perf drop in SynMark2 OglPSPom

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110029

            Bug ID: 110029
           Summary: [GEN8+] 1-2% perf drop in SynMark2 OglPSPom
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Setup:
* Ubuntu 18.04 with Unity/compiz
* v4.19+ drm-tip kernel & git version of Xserver
* Mesa git version
* BSW/BDW/BXT/SKL/KBL/CFL HW
* FullHD monitor

Test-case:
* SynMark2 v7 OglPSPom test in FullHD fullscreen

Performance of that has dropped by 1-2% on all GEN8+ platforms between
following Mesa commits:
* 2019-02-01 17:34:02 ab940b0d97: spirv: Support LocalSizeId and
LocalSizeHintId execution modes
* 2019-02-02 14:42:14 0aa5a97b03: relnotes: Add VK_EXT_buffer_device_address

There was no perf drop on SNB/HSW, or in other benchmarks I'm running.

Wontfixing this is fine, but I think somebody should bisect it first.

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