[Bug 110745] [GEN9+] 3-7% perf drop in SynMark2 v7 CSDof

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110745

            Bug ID: 110745
           Summary: [GEN9+] 3-7% perf drop in SynMark2 v7 CSDof
           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

Mesa performance in SynMark2 v7 CSDof test dropped 3-7% on all our GEN9
devices.  

Setup:
- Ubuntu 18.04
- Unity / compiz desktop
- Mesa from git
- X server and drm-tip kernel from git within last 1-2 months, with modifier
support enabled
- FullHD monitor

Test-case:
- synmark2 OglCSDof
  (configured to run in fullscreen FullHD resolution.)

Regression happened between following commits:
* 2019-05-14 16:23:12 e81392868e: iris/resource: Drop redundant checks for aux
support
* 2019-05-15 04:34:49 a9cef4f0e5: gallium: Add default check for
PIPE_CAP_FRAGMENT_SHADER_INTERLOCK

Notes:
* There are a lot of compiler changes between these dates
* Only CSDof test performance changed, and only on GEN9 devices (not on GEN7-8
ones)

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