[Bug 102334] New: [BXT]15% performance drop in SynMark v7.0 Multithread use-case

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102334

            Bug ID: 102334
           Summary: [BXT]15% performance drop in SynMark v7.0 Multithread
                    use-case
           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
     i915 platform: BXT

drm-tip kernel has caused ~15% drop in SynMark v7.0 Multithread 3D use-case
between these commits:

kernel git://anongit.freedesktop.org/drm-tip at
560582ef03d1f6bf9010232fcc6613188a00d198 2017-07-17_16-27-42 drm-tip:
2017y-07m-17d-16h-27m-16s UTC integration manifest

kernel git://anongit.freedesktop.org/drm-tip at
10de1e17faaab452782e5a1baffd1b30a639a261 2017-07-18_10-09-14 drm-tip:
2017y-07m-18d-10h-08m-42s UTC integration manifest

(This test has quite a large variance, but 15% drop in this period is very
clear from the longer term trend.)

This drop is BXT specific and visible on 2 different BXT (18 EU) J4205 devices.

Multithread test has 4 work threads doing low and hi resolution reflections /
environment map rendering, with main thread rendering the final HDR image with
tone mapping and bloom.  This requires enough draw calls & syching that this
test is (mostly) CPU bound.

Note: The less CPU bound version (HdrBloom) of this test, which has only 1 work
thread instead of 4, and which uses higher resolution & details for that,
doesn't show any (clear) performance regression.

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