[Bug 81986] New: [BDW Bisected] etqw-demo/lightsmark/warsow01/unigine-demos/Synmark2_v6/GLBenchmarkv2.5.1/v2.7.0 performance reduced 10%~50%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81986

          Priority: medium
            Bug ID: 81986
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Bisected]
                    etqw-demo/lightsmark/warsow01/unigine-demos/Synmark2_v
                    6/GLBenchmarkv2.5.1/v2.7.0 performance reduced 10%~50%
        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

Environment:
----------------------------------------------
Platform: BDW
Libdrm: (master)libdrm-2.4.56
Mesa: (master)66decc7efa08ae9c94e4bd11038cfe8b3132d554
Xserver:
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel: (master)2.99.914-8-ga88795c64123e4084044451d8861838ea904abd9
Cairo: (master)f337342c88092a251dc00476c4a9880d1cb90822
Libva: (master)3fddb7f937df4e0e15391bd65ae3c7552ea5b3d7
Libva_intel_driver: (master)82d2ed8d7da3619c0ea467c06604f5626fc0b901
Kernel:    (drm-intel-nightly) git-eb2af9

Bug detailed description:
---------------------------------------------------
etqw-demo/lightsmark/warsow01/unigine
demos/GLBenchmark_2.5.1/GLBenchmark_v2.7.0/3DMMES2_taiji/
hoverjet/Synmark2_v6_(OglFillTexMulti/OglPSBump2/OglPSBump8/OglPSPhong/OglPSPom/OglShMapPcf/
OglShMapVsm/OglTexFilterTri/OglTexMem128/OglTexMem512/OglDeferred) performance
reduced 10%~50%.
This problem doesn’t exist on IVB/BYT-M/HSW, The problem exists both on
gnome-session and Raw X.
BTW, after revert bad commit, it can works well.
It’s Kernel(drm-intel-next-queued) regression, bisecting show that the first
bad commit is: 66bc2cab191816d931f4d660d2f162130dd202b2
Author:     Paulo Zanoni <paulo.r.zanoni at intel.com>
AuthorDate: Wed Jul 16 17:49:30 2014 -0300
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Jul 23 07:05:37 2014 +0200

    drm/i915: BDW can also detect unclaimed registers


Reproduce steps:
---------------------------------------------
1.    xinit&
2.    vblank_mode=0 ./backend silent 1920x1080

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