[Bug 57830] New: [IVB bisected]Lightsmark performance reduced by 9%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57830

          Priority: medium
            Bug ID: 57830
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB bisected]Lightsmark performance reduced by 9%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: yex.tian at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:       
----------------------------------------------
Platform:IVB
Libdrm:    (master)libdrm-2.4.40-3-g0980633afd9c7eecc0c75ef3bea4d3c6b7aa1898
Mesa:    (9.0)d0a9ab29b2c8abf2900b1095883cba71b05b5cd9
Xserver:(server-1.13-branch)xorg-server-1.13.0.901
Kernel: (drm-intel-fixes)7b01e260a6cad9152eefb44ce64f3a2073af1e6b

Bug detailed description:
----------------------------------------------
Lightsmark performance reduced by ~9% only on IVB. 
It's Kernel regression. By bisected, show that 61939d9 is the first bad commit.

commit 61939d977d66951b04cfd4fbe75705614b98ecad
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date: Tue Oct 2 17:43:38 2012 -0500

drm/i915: implement WaForceL3Serialization on VLV and IVB

Performance:
-----------------------------------------------
ff1f525 is 61939d9 parents commit.
             61939d9  ff1f525      61939d9 vs. ff1f525
xinit           77      71               9%
gnome-session   83      77               9%

Reproduce steps:
---------------------------------------------
1, xinit&
2, vblank_mode=0  ./backend silent 1920x1080

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