[Bug 111731] New: [SKL GT4e] large perf drop (up to 27%) in most 3D benchmarks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111731

            Bug ID: 111731
           Summary: [SKL GT4e] large perf drop (up to 27%) in most 3D
                    benchmarks
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: major
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Setup:
* HW: SKL i7-6770HQ
* OS: Ubuntu 18.04 desktop
* SW stack: git versions of drm-tip kernel, X and Mesa

Between following drm-tip kernel 5.3-rc8 commits:
* 2019-09-10_13-35-40 32c81a317364: drm-tip: 2019y-09m-10d-13h-34m-53s UTC
integration manifest
* 2019-09-11_15-07-28 b27acd37b7de: drm-tip: 2019y-09m-11d-15h-06m-37s UTC
integration manifest

Kernel performance dropped in most 3D benchmarks.  Worst cases were:
* 27% SynMark CSDof (fullscreen)
* 20-25% GpuTest Triangle (1/2 screen window), SynMark VSTangent
* 20% Unigine Heaven, GpuTest Triangle (fullscreen), SynMark DeferredAA

With few months old git version of Mesa & X server, perf drop in SymMark Fill*
tests was also ~20%.

There seems also to be few percent improvement in synMark TexMem* tests kernel
performance at the same time, but that's visible only with specific Mesa driver
(i965, or Iris) and X server versions.  Performance change in other tests than
memory bandwidth ones isn't significantly impacted by Mesa/Xorg version, only
by kernel.

This drop is specific SkullCanyon, it's not visible on others platforms (KBL
GT3e, SKL/BDW GT2, BXT).  While 3D benchmarks are impacted most, there seems to
be marginal perf drop also in Media (transcode) tests.

Although this impacts only SkullCanyon, setting severity as major because the
perf drop is so large.

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