[Bug 83482] New: [BDW Bisected]Doom3 v1.3.1/etqw-demo/Lightsmarkv2008/OpenArena v0.8.8/warsow v1.0/Xonotic v0.7/CS/Half life2/Team Fortress 2/Portal/GpuTest v0.5/Unigine-demos/GLBenchmarkv2.5.1/v2.7.0/Synmark2_v6 performance reduced 10%~40%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83482

          Priority: medium
            Bug ID: 83482
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Bisected]Doom3
                    v1.3.1/etqw-demo/Lightsmarkv2008/OpenArena
                    v0.8.8/warsow v1.0/Xonotic v0.7/CS/Half life2/Team
                    Fortress 2/Portal/GpuTest
                    v0.5/Unigine-demos/GLBenchmarkv2.5.1/v2.7.0/Synmark2_v
                    6 performance reduced 10%~40%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Platform:BDW
Libdrm:(master)libdrm-2.4.56-21-g8c2ae1695913990cbe6c6a8aa294f354eba33bd0
Mesa:(master)2adf7ee92e19ca978d6dac29fead59f14d033f3e
Xserver:(master)xorg-server-1.16.0-152-g3a51418b2db353519a1779cf3cebbcc9afba2520
Xf86_video_intel:(master)2.99.914-86-g48a33fc379b17eed195875222ad773c911d9dff1
Cairo:(master)8e11a42e3e9b679dce97ac45cd8b47322536a253
Libva:(master)c356638098e55453d2fac8bbb92eafc8cc32d6f4
Libva_intel_driver:(master)865f288d6821dfea5a9dc2a0525eba69ef786b23
Kernel:(drm-intel-nightly)2b1159961e4bc38a9090f8ec0ab6f16701dbdf81

Bug detailed description:
--------------------------------------------------
Doom3 v1.3.1/etqw-demo/Lightsmarkv2008/OpenArena v0.8.8/warsow v1.0/Xonotic
v0.7/CS/Half life2/Team Fortress 2/Portal/GpuTest
v0.5/Unigine-demos/GLBenchmarkv2.5.1/v2.7.0/Synmark2_v6(OglBatch4/OglBatch5/OglDeferred/OglDeferredAA/OglFillTexMulti/OglHdrBloom/OglPSBump2/OglPSBump8/OglPSPhong/OglPSPom/OglShMapPcf/OglShMapVsm/OglTexFilterTri/OglTexMem128/OglTexMem512/OglTexFilterAniso/)
performance reduced 10%~40% on BDW,This issue doesn't exist on IVB/HSW/BYT-M.

It's kernel regression(drm-intel-next-queued),bisected the result show first
bad commit is:e3fa2c1fe53005d12db525fd4d9b13c2de4e219c 
Author:     Arun Siluvery <arun.siluvery at linux.intel.com>
AuthorDate: Tue Aug 26 14:44:50 2014 +0100
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Fri Aug 29 10:56:03 2014 +0200
    drm/i915/bdw: Apply workarounds in render ring init function

BTW,this issue also exist on drm-intel-nightly kernel branch.

Reproduce step:
----------------------------------------------------
1. xinit&
2. ./synmark2 OglFillTexMulti

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