[Bug 82753] New: [IVB/BYT-M/HSW Bisected]Synmark2_V6.0(OglDrvCtx) performance reduced ~15%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82753

          Priority: medium
            Bug ID: 82753
          Assignee: idr at freedesktop.org
           Summary: [IVB/BYT-M/HSW Bisected]Synmark2_V6.0(OglDrvCtx)
                    performance reduced ~15%
        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/HSW
Libdrm: (master)libdrm-2.4.56-8-gd9ce09de12131fa8c5ff2d7c2dbd6b61d8a5fd14
Mesa: (master)ef130b6050fc91c12a220f19d8bdd659712f7fb9
Xserver:
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel: (master)2.99.914-55-gf8e632f396bf4b0473dca0516567d56a29954cf3
Cairo: (master)7736d08e22ffd7ab9968617164c7e027125b7755
Libva: (master)acfcd5f0637a951d50c5112c7dfbd46f1d0dcdb3
Libva_intel_driver: (master)82d2ed8d7da3619c0ea467c06604f5626fc0b901
Kernel_version: drm-intel-nightly(git-186631)

Bug detailed description:
----------------------------------------------
Synmark2_V6.0_OglDrvCtx performance reduced ~15% on IVB/BYT-M/HSW, this issue
doesn't exist on BDW, The problem exists both on gnome-session and Raw X.
It’s Mesa regression, bisecting show that the first bad commit is:    
commit 2f28a0dc23165123cf1e8b5942acad37878edd8a
Author:     Kristian Høgsberg <krh at bitplanet.net>
AuthorDate: Mon Jul 7 16:44:58 2014 -0700
Commit:     Kristian Høgsberg <krh at bitplanet.net>
CommitDate: Fri Aug 15 11:25:47 2014 -0700
i965: Implement fast color clears using meta operations

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

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