[Bug 83046] New: [BDW bisected]] Warsow v1.0/Xonotic v0.7/Gputest v0.5_triangle_fullscreen/synmark2_v6 performance reduced 30%~60%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83046

          Priority: medium
            Bug ID: 83046
          Assignee: idr at freedesktop.org
           Summary: [BDW bisected]] Warsow v1.0/Xonotic v0.7/Gputest
                    v0.5_triangle_fullscreen/synmark2_v6 performance
                    reduced 30%~60%
        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: BDW
----------------------------------------------
Libdrm: (master)libdrm-2.4.56-10-g22b995d8cbf1059535c5de5ba1869c1623ae5b08
Mesa: (master)8d8a5eb792c662a8def7c9ab65d2df67972cf659
Xserver:
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel: (master)2.99.914-67-g12c051d5c673d79c16a3a1478c0977799484ca95
Cairo: (master)13a09526d2120c244471e03b6ae979016ef88e83
Libva: (master)acfcd5f0637a951d50c5112c7dfbd46f1d0dcdb3
Libva_intel_driver: (master)f3f49f2f0e6b3669d9b09341a11cf0b96e138674
Kernel: (drm-intel-nightly)257d90d13794c2eb545ab0d6c708f21e2a0378b6

Bug detailed description:
-----------------------------------------------
Warsow v1.0/Xonotic v0.7/Gputest
v0.5_triangle_fullscreen/synmark2_v6(OglBatch0-OglBatch7/OglGeomPoint)
performance reduced 30%~60% on BDW, This issue only exist on BDW, this issue
exist both on Raw X and gnome-session.
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 OglBatch0

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