[Bug 78997] New: [HSW bisected]Aquarium performance reduced a lot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78997

          Priority: medium
            Bug ID: 78997
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW bisected]Aquarium performance reduced a lot
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:       
----------------------------------------------
Platform: HSW
Libdrm:(master)libdrm-2.4.54-9-g8fc62ca8ac010659023bb63c4759eb683de4f9af
Mesa:    (master)52381a7ffba908410f7a53855f082401fca7293a
Xserver:(master)xorg-server-1.15.99.902-91-g01e18af17f8dc91451fbd09020
Xf86_video_intel:(master)2.99.911-177-gbfd0e41d5c7b8bff28ff429b26f4c977e
Cairo:(master)ead5c7909f3db1d0d81121fc2775c458871891b2
Libva:(staging)51901e340cc467a2d562491121e0de38f5a066fe
Libva_intel_driver:(staging)b3031d16b1ea9ef2ab95bc09e59f0db5214a1125
Kernel: (drm-intel-nightly) git-0791a3

Bug detailed description:
Aquarium performance reduced a lot on HSW. The problem only exists on
gnome-session, The problem doesn’t exist on BYT and IVB.

It’s kernel(drm-intel-next-queued) regression, bisecting show that the first
bad commit is:78e8fc6b2e3bbce6170d2ead2406d29930077735
Author:     Ville Syrjälä <ville.syrjala at linux.intel.com>
AuthorDate: Tue Apr 29 13:35:44 2014 +0300
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon May 5 09:09:25 2014 +0200

    drm/i915: Fix scanout position for real


Reproduce steps:
--------------------------------------------------------------------
1. xinit& 
2. google-chrome-stable --enable-webgl --ignore-gpu-blacklist --user-data-dir
Aquarium.html

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