[Bug 103110] [GEN7]=?UTF-8?Q?=C2=A010=2D20=25=20drop=20in=20SynMark=20terrain=20tests=20perf?=, 4% drop in Manhattan 3.0 perf

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103110

            Bug ID: 103110
           Summary: [GEN7] 10-20% drop in SynMark terrain tests perf, 4%
                    drop in Manhattan 3.0 perf
           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

On HSW GT2, performance dropped in following tests:
- 10-20% in 4 SynMark2 v7 Terrain tests
- 4% in GfxBench Manhattan 3.0
- 2% in GfxBench T-Rex
- 1-2% in GfxBench CarChase

GfxBench tests perf drop both for onscreen & offscreen versions.

Similar, but much smaller drops are visible also on BYT.  I don't see drops in
these cases on SNB or GEN8+ platforms, so it seems GEN7 specific.


This drop happens between following commits:
- Good: 7f3eab03fe041bc28900a02f7ae503920753ea6b 2017-10-02 freedreno/a5xx: fix
missing restore state
- Bad:  df6b320a83c89b6401fde888375529b3fc66f4fa 2017-10-03 etnaviv: Set up
unknown GC3000 states

Looking at the commits between this range, one of following changes could be
the cause for the drop:
- intel: Always set Cube Face Enables for all surfaces.
- refactor for: i965: Implement ARB_indirect_parameters
- glsl refactor done by Ian

Hopefully somebody has time to bisect this further.

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