[Bug 83793] New: [BYT Regression]3D performance reduced 10%~70%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83793

          Priority: medium
            Bug ID: 83793
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]3D performance reduced 10%~70%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Platform:BYT-M
Libdrm:(master)libdrm-2.4.56-21-g8c2ae1695913990cbe6c6a8aa294f354eba33bd0
Mesa:(master)5cf8d9f54b2e27721f8c79e553377834b3005022
Xserver:(master)xorg-server-1.16.0-152-g3a51418b2db353519a1779cf3cebbcc9afba2520
Xf86_video_intel:(master)2.99.916-9-gf2b62ab38f0f5970b2f868e10dc3499ff3118dbb
Cairo:(master)8e11a42e3e9b679dce97ac45cd8b47322536a253
Libva:(master)e0d25ece01e7aba819c910e98c4fb4706cdab055
Libva_intel_driver:(master)238d8077705711036d62a6d536311def3ef35035
Kernel:(drm-intel-nightly)72faa6a63351879b381bd9e4013f38bc94f11999

Bug detail description:
-------------------------------------------------------
3D performance reduced 10%~70% on BYT-M,this issue doesn't exist on
IVB/HSW/BDW.
It's kernel regression,i know kernel(drm-intel-nightly) good commit is
git-51c49ea and kernel(drm-intel-nightly) bad commit is git-72faa6a. but i
can't found detail branch.

Reproduced step:
---------------------------------------------------
1. xinit&
2.  ./synmark2 OglBatch0

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