[Bug 67157] New: [ILK bisected] x11perf –aa10text performance reduced by ~37% enabling SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67157

          Priority: medium
            Bug ID: 67157
          Assignee: chris at chris-wilson.co.uk
           Summary: [ILK bisected] x11perf –aa10text performance reduced
                    by ~37% enabling SNA
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mengmeng.meng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

System Environment:       
----------------------------------------------
Platform:  Ironlake
Libdrm:       (master)libdrm-2.4.46-2-gfea5408098c3c3057958e85ea9d7146f0b08749e
Mesa:       (master)cd90ebefd4f63d00eb65af6069fb078e454c43f1
Xf86_video_intel:(master)2.21.12-36-g2737aaab77cc6233826077b90d001fe45efc376c
Kernel:    (drm-intel-nightly)79e7b6f2cd7a75ff57207f763abf46cfe709e8de

Bug detailed description:
----------------------------------------------
x11perf –aa10text performance reduced by ~37% enabling SNA on Ironlake. 
It’s xf86_video_intel regression, bisecting show the first bad commit is that:

commit 16fb786bd0791986fcac8b11a7e182090c5b6249
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Jun 23 09:00:17 2013 +0100
    sna/gen5: Force a write flush when changing blend modes

Performance(x11perf –aa10text):
------------------------------------------
               SNA        disable SNA
git-9eabe28    9650000    1520000
git-16fb786    15500000   1520000

Reproduce steps:
---------------------------------------------
1. xinit&
2. vblank_mode=0 ./x11perf_x86_64 -aa10text

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