[Bug 107706] [GEN8+] up to 10% perf drop on several 3D benchmarks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107706

            Bug ID: 107706
           Summary: [GEN8+] up to 10% perf drop on several 3D benchmarks
           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

There's up to 10% performance drop on *all* GEN8+ platforms, exactly same as in
bug 107510.

On SKL GT2, the regressions are following:
- 10% GfxBench Tessellation (onscreen & offscreen)
- 5% SynMark2 GSCloth
- 2-3% GpuTest Julia FP64
- 1-2% Unigine Heaven (high quality with tessellation, no AA)
- 1% GfxBench ALU2 (onscreen & offscreen), SynMark PSPom

On other GEN8+ platforms the regressing cases are the same, but percentages
differ somewhat.  Performance didn't improve in any test.

Setup:
- Mesa from git
- drm-tip kernel and X server git versions within couple of months
- Modifier support enabled (shouldn't matter as offscreen versions also
regress)

Regressions happen between following Mesa git versions:
* 855af9a5a2: 2018-08-23 16:00:28 "travis: use python3 for the autoconf builds"
* 7f745c19c1: 2018-08-24 16:35:24 "docs: Update calendar, news, relnotes for
18.1.7"

(Jason's array splitting commits seems most likely thing affecting these.)

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