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        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [ILK bisected] x11perf –aa10text performance reduced by ~37% enabling SNA"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=67157">67157</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>chris@chris-wilson.co.uk
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ILK bisected] x11perf –aa10text performance reduced by ~37% enabling SNA
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mengmeng.meng@intel.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Driver/intel
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr></table>
      <p>
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        <pre>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 <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
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</pre>
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