[Bug 82592] New: [IVB/BYT/BDW Bisected]etqw-demo/Lightsmarkv2008/warsowv1.0/Counter-Strike:source/Half-Life2/Portal/synmark2_v6/unigine-demos/GLbenchmarkv2.5.1/GLbenchmarkv2.7.0/3DMME2.0_taiji/3DMME2.0_hoverjet performance reduced 10%~90%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82592

          Priority: medium
            Bug ID: 82592
          Assignee: idr at freedesktop.org
           Summary: [IVB/BYT/BDW
                    Bisected]etqw-demo/Lightsmarkv2008/warsowv1.0/Counter-
                    Strike:source/Half-Life2/Portal/synmark2_v6/unigine-de
                    mos/GLbenchmarkv2.5.1/GLbenchmarkv2.7.0/3DMME2.0_taiji
                    /3DMME2.0_hoverjet performance reduced 10%~90%
        QA Contact: intel-3d-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: Drivers/DRI/i965
           Product: Mesa

Platform: IVB/BYT/BDW
Libdrm: (master)libdrm-2.4.56-4-g07fead4462b2d537d0c3cae69a09272fc426c598
Mesa: (master)52901ec2615761390f5ef97b11516dae330d27d1
Xserver: (master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f
Xf86_video_intel: (master)2.99.914-46-gec10cef592b7a3d1dc3c4949778e72e8
Cairo: (master)c7ff9bb32e20679d6da4e8a2856be716e5bd9e12
Libva: (master)3fddb7f937df4e0e15391bd65ae3c7552ea5b3d7
Libva_intel_driver: (master)82d2ed8d7da3619c0ea467c06604f5626fc0b901
Kernel_version: drm-intel-nightly(git-723dbb)

Bug detailed description:
----------------------------------------------
etqw-demo/Lightsmarkv2008/warsowv1.0/Counter-Strike:source/Half-Life2/Portal/synmark2_v6(OglBatch0-Oglbatch7/OglDrvRes/OglDrvShCom/OglDrvState/OglGeomPoint/OglGeomTriList/OglGeomTristrip/OglHdrBloom/OglVSDiffuse1/OglVSDiffuse8/OglVSlnstancing/OglVSTangent)unigine-demos/GLbenchmarkv2.5.1/GLbenchmarkv2.7.0/3DMME2.0
taiji/hoverjet performance reduced 10%~90% on IVB/BDW/BYT, this problem doesn't
exist on HSW, The problem exists both on gnome-session and Raw X.

It’s Mesa regression, bisecting show that the first bad commit is:    
af13cf609f4257768ad8b80be8cec7f2e6ca8c81
Author:     Kenneth Graunke <kenneth at whitecape.org>
AuthorDate: Sun Aug 10 20:06:44 2014 -0700
Commit:     Kenneth Graunke <kenneth at whitecape.org>
CommitDate: Tue Aug 12 13:39:25 2014 -0700
    i965/vec4: Use MOV, not OR, to set URB write channel mask bits.

Reproduce steps:
---------------------------------------------
1.   xinit&
2.  ./synmark2 OglBatch0

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