[Bug 93622] [All Regression]X11perf/ Gputest_v0.5_triangle_windows_640x480 case performance dropped by 12%--60%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93622

            Bug ID: 93622
           Summary: [All Regression]X11perf/
                    Gputest_v0.5_triangle_windows_640x480 case performance
                    dropped by 12%--60%
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: wendy.wang at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 120852
  --> https://bugs.freedesktop.org/attachment.cgi?id=120852&action=edit
xorg.log

System Environment: 
Regression: Yes     
Platform:  All the platforms(IVB/HSW/BYT/BSW/SKL)

Description:
When we run Gputest_v0.5_triangle_windows_640x480 case with bad test
environment, we've found performance fps dropped by 12%.

And check 2D_X11perf_V1.5_aa10text and 2D_X11perf_V1.5_aa10text has more drop
from 15%--60%. 

we try to do below steps to dig out which driver caused it:
1. compile good mesa/xf86/xserver onto the bad environment, performance fps
still bad.
2. Switch to the good kernel on the bad environment, performance fps is bad 
3. Start gnome-session: performance is bad running with bad environment.
4. without start gnome-session: performance is good running with bad
environment.
so seems like gnome-session related, we've no idea which driver impacted it.


Bad test environment:
Ubuntu 14.04 LTS
gnome-session 3.9.90
Kernel:4.4-rc8-drm-intel-nightly-0417da
Mesa: 86fa484
xf86: 2.99.917-523-g082a57e
xserver: 1.18.99.1


Good test environment:
Ubuntu 14.04 LTS
gnome-session 3.9.90
Kernel:4.4-rc6-drm-intel-nightly-ec0382
Mesa: dfce975
xf86: 2.99.917-517-gbc4ffba
xserver: 1.18.99.1

Reproduce steps:
1. xinit &
2. gnome-session &
3. ./GpuTest /test=triangle /width=640 /height=480 /fullscreen /benchmark
/no_scorebox

xorg attached.

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