[Bug 89860] New: [BSW] Performance value reduced by 600% when running WebGL earthscreen case(fail rate 1/3)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89860

            Bug ID: 89860
           Summary: [BSW] Performance value reduced by 600% when running
                    WebGL earthscreen case(fail rate 1/3)
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: wendy.wang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

System Environment:       
-----------------------------------------------------
Non-working platforms: Braswell
Browser: Google Chrome 33.0.1750.152
Desktop environment: gnome-session
Case running window: window mode by default
2015-3-24 graphics stack:
Kernel:   (drm-intel-nightly)26db3817223d120e791f36b6be1d52b1aece47c7
Libdrm:       
(master)libdrm-2.4.60-17-g8dff7a04780a0f028aa7c0218806a5ee59b1a40d
 Mesa:        (master)43277fcd59b163a8bdd00d7875557bb71ecf48ff
 Xserver:       
(master)xorg-server-1.17.0-23-g0a78b599b34cc8b5fe6fe82f90e90234e8ab7a56
 Xf86_video_intel:       
(master)2.99.917-203-g44452825fb862c81957f53e04f739e2d96864f91
 Cairo:        (master)71392653803277cec6deea9e7aa4696f8b22dd73

Bug detailed description
--------------------------
This is intermittent issue, the fail rate is about 1 out 3 cycles.
When issue happened, the performance values dropped to below 10 fps, while in
normal status, we can get 50 fps.


Regression: Yes
---------------------------- 
Bisect still in the progress in drm-intel-next-queued branch
Good kernel commit:(drm-intel-nightly) 8b4216f91c7bf8d3459cadf9480116220bd6545e 
Bad kernel commit: (drm-intel-nightly)26db3817223d120e791f36b6be1d52b1aece47c7


==Reproduce steps==
---------------------------- 
1.start web server
2.run /usr/local/games/WebGL/earthscreen/earth4Video.html by google-chrome

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