[Bug 85126] New: [BDW Bisected]Synmark2_OglGeomPoint performance reduced ~25%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85126

            Bug ID: 85126
           Summary: [BDW Bisected]Synmark2_OglGeomPoint performance
                    reduced ~25%
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: lilix.cheng at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Environment:
-----------------------------------
Platform:BDW
Libdrm:(master)libdrm-2.4.58-4-g00847fa48b83a85b0cb882594a12ed1511f780db
Mesa:(master)b86f814afd4a8cc1d5a17308fcdd05fbb937ae93
Xserver:(master)xorg-server-1.16.0-418-g61a292adf45405641de1c522a04c148e0a152acd
Xf86_video_intel:(master)2.99.916-95-g49376ba3bddd15e62df55928198160d9970dc1c6
Cairo:(master)ab2a7b61d59258b71e1c3256edf2f42ea6cc1eb2
Libva:(master)ccd93de5a707e92a629cccd595757c8d436fa3cc
Libva_intel_driver:(master)f11176415ec26eb5960ba6841d2d9c22f2cabc60
Kernel:(drm-intel-nightly)ead7d71357628dc1231535886ec09853e9164d6d

Bug detailed description:
---------------------------------------------
Synmark2_OglGeomPoint performance reduced ~25% on BDW.
This problem exist both on gnome-session and Raw X.
It's Mesa regression,bisect result first bad commit is:

commit b7844d12487dbac702ecd734faeffa6fe1a61a83
Author:     Kenneth Graunke <kenneth at whitecape.org>
AuthorDate: Tue Sep 30 01:15:56 2014 -0700
Commit:     Kenneth Graunke <kenneth at whitecape.org>
CommitDate: Thu Oct 9 15:03:32 2014 +0200

    i965: Use BDW_MOCS_PTE for renderbuffers.

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

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