[Bug 89760] New: [HSW Bisected]WebGL Google Auqarium/Google Dynamic Cubemap/Earthscreen/Google Toon-Shading cases performance value dropped by 20%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89760

            Bug ID: 89760
           Summary: [HSW Bisected]WebGL Google Auqarium/Google Dynamic
                    Cubemap/Earthscreen/Google Toon-Shading cases
                    performance value dropped by 20%
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: wendy.wang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114616
  --> https://bugs.freedesktop.org/attachment.cgi?id=114616&action=edit
Xorg log

Regression: yes
It's xorg driver regression, this issue can be more obvious on HSW Platforms.
>From bisect result, below commit is the first bad commit:

commit 72d208a7f2f0e8f2d93483e535154f34a8a26d81
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Mar 5 12:26:15 2015 +0000

sna/dri2: Perform swap elision on windows for swap-interval==0


Run WebGL cases: Google  Auqarium/Google Dynamic Cubemap/Earthscreen/Google
Toon-Shading cases on HSW, these cases performance fps dropped by 20%.

Reproduce tool-shading case steps:
1. Download
http://webglsamples.googlecode.com/hg/toon-shading/toon-shading.html to local
2. Execute:
http://tinderbox.sh.intel.com/webglsamples.googlecode.com/hg/toon-shading/toon-shading.html


Earth screen download address:
http://pnp.sh.intel.com/benchmarks/WRTBench_Packages/WRTBench_latest_project/WebGL-EarthScreen/earth4Video.html

dynamic-cubemap download address:
http://webglsamples.googlecode.com/hg/dynamic-cubemap/dynamic-cubemap.html

aquarium download address:
http://webglsamples.googlecode.com/hg/aquarium/aquarium.html

xorg.log file has been attached.

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