[Bug 70948] New: [Regression] x11perf-1.5 performance reduced ~12% with gnome-session

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70948

          Priority: medium
            Bug ID: 70948
          Assignee: chris at chris-wilson.co.uk
           Summary: [Regression] x11perf-1.5 performance reduced ~12% with
                    gnome-session
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 88212
  --> https://bugs.freedesktop.org/attachment.cgi?id=88212&action=edit
perf report log

System Environment:       
----------------------------------------------
Platform:IVB/HSW
Libdrm:    (master) 2.4.47
Mesa:    (master) 7f7636830514ae37b9df9969c44637f55323d608
Xserver:(master) xorg-server-1.14.99.3-1-g7ecfab47eb221dbb996ea6c033
Xf86_video_intel:(master) 2.99.905-14-g64b9f57451501830f8031d1b6ac7289642da032d
Cairo:    (master) 98fef3cef2d0f7f463a2e4f9f1b35b09f7b6ea77
Kernel:    (drm-intel-nightly) 164a4cb4c1431a0689f85507868356fae24da638
gnome-shell:3.8.4-2

Bug detailed description:
---------------------------------------------
x11perf-1.5 performance reduced ~12% with gnome-session on IVB/HSW . The
problem doesn’t exist on Raw X.
It’s xserver regression. Compiling error when bisected this problem, so can’t
get first bad commit. The recent xserver good commit is git-7d3d4ae.
Please see “perf report log” attached.

Performance on IVB desktop
--------------------------------------------
             xinit     gnome-session
git-7d3d4ae   25100000   25600000            
git-ccbe17b   25100000   22900000     


Reproduce steps:
--------------------------------------------------------------------
1. xinit&
2. gnome-session
3. x11perf -aa10text

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