[Bug 111090] New: 3% perf drop in GfxBench Manhattan 3.0, 3.1 and CarChase test-cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111090

            Bug ID: 111090
           Summary: 3% perf drop in GfxBench Manhattan 3.0, 3.1 and
                    CarChase test-cases
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         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

Between following drm-tip commits:
* e8f06c34fa: 2019y-05m-27d-14h-41m-23s UTC integration manifest
* 8991a80f85: 2019y-05m-28d-15h-47m-22s UTC integration manifest

There was a performance drop in GfxBench Manhattan 3.0 (gl_manhattan) & 3.1
(gl_manhattan31) and CarChase (gl_4) test-cases:
* testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan

This drop is visible both with onscreen and offscreen tests, both with X server
/ Unity and Weston.

Performance drop is most clear with Weston / GLES on BXT, regardless of whether
test-case runs under Xwayland or is Wayland native, where it's close to 3%.

With X server / GL, perf drop is visible only in Manhattan 3.0 on BXT, and
marginally in Manhattan 3.1 on KBL GT3e.

No test-cases have improved their performance in this same time period.

This regression isn't visible on BDW GT2 or SKL GT2 (I have data only from
these 5 machines).

Looking at the iowait and RAPL data, at least the Manhattan 3.0 test-case is
now  a bit more GPU (IO) bound, and GPU (uncore) uses clearly less power.  I.e.
it seems that since end of May, kernel doesn't let Mesa to utilize GPU as fully
as before.

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