[Bug 90224] New: [SKL/BSW/BDW Bisected]Synmark2_v6 OglBatch6/7 and OglDrvState performance reduced by 8%-24%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90224

            Bug ID: 90224
           Summary: [SKL/BSW/BDW Bisected]Synmark2_v6 OglBatch6/7 and
                    OglDrvState performance reduced by 8%-24%
           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

Created attachment 115426
  --> https://bugs.freedesktop.org/attachment.cgi?id=115426&action=edit
dmesg file

==System Environment==
--------------------------
Kernel Regression: YES

Non-working platforms: BDW/BSW/SKL

Used GFX SW Stack:
 Libdrm:       
(master)libdrm-2.4.60-34-g0d78b37b1cac304ce5e84d1207f0a43abd29c000
 Mesa:        (master)d5a15a89f081bdd23237b8ba5391a2ebea60468b
 Xserver:       
(master)xorg-server-1.17.0-76-gb1029716e41e252f149b82124a149da180607c96
 Xf86_video_intel:       
(master)2.99.917-287-g09d8e5e1b3215c0e58c2ce44048458152c523270
 Cairo:        (master)2cf2d8e340a325adb205baf8e4bd64e1d1858008

==kernel==
Bisect from drm-intel-next-queued branch, the first bad commit show as below:
commit 9258811c961879450502f767773227f5c0d79120   
71b7e54f71b899db9f8def67a0e976969384e699
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Tue Apr 14 17:35:19 2015 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Thu Apr 23 21:06:02 2015 +0200

    drm/i915: Don't use atomics for pg_dirty_rings

    It's already protected by the bkl^Wdev->struct_mutex. While at it
    realign some related code.

    Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>


==Bug detailed description==
BDW Platform, synmark2_6 OglBatch6 performance dropped by 12%, OglBatch7
performance dropped by 22%
SKL platform, synmark2_6 OglBatch6 performance dropped by 21%, OglBatch7 
performance dropped by 24%

==Reproduce steps==
1. cd /usr/local/games/OpenGL/SynMark2
2. ./synmark2 OglBatch6

Dmesg file has been attached.

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