[Bug 71117] New: [BYT-M Bisected] x11perf –aa10text performance reduced ~78%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71117

          Priority: medium
            Bug ID: 71117
          Assignee: chris at chris-wilson.co.uk
           Summary: [BYT-M Bisected]x11perf –aa10text performance reduced
                    ~78%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 88467
  --> https://bugs.freedesktop.org/attachment.cgi?id=88467&action=edit
Perf report for bad commit

System Environment:     
----------------------------------------------
Platform: BYT-M
Libdrm:(master)2.4.47-2-g45810d3d7546f3ddbcdae114c6726ada30e919c9
Mesa: (master)git-8bd4476
Xserver: (master)xorg-server-1.14.99.3-24-g902ff0b3497d20
Xf86_video_intel: (master)2.99.905-41-ged16e34c00d5eb5c
Cairo: (master)98fef3cef2d0f7f463a2e4f9f1b35b09f7b6ea77
Kernel:    (drm-intel-nightly) 164a4cb4c1431a

Bug detailed description:
----------------------------------------------
X11perf –aa10text performance reduced ~78% on Raw X and gnome-session. The
problem only exists on BYT-M.
It’s Xf86_video_intel regression, bisecting show that the first bad commit is:
40d4199f151a39ecebf127cf468b4470d2906f4e
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Oct 28 10:45:52 2013 +0000
    sna: Use page-count for mappable aperture size
    For consistency with the other aperture metrics and correctness when
    passing around required number of pages.
Signed-off-by: Chris Wilson chris at chris-wilson.co.uk

Performance
--------------------------------------------------------------------
X11perf –aa10text on Raw X
drm-intel-next-queued     git-40d4199  git-9266e35
                          1490000        6860000

Reproduce steps:
---------------------------------------------
1, xinit&
2, vblank_mode=0 x11perf –a10text

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