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<base href="https://bugs.freedesktop.org/" />
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<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>
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</tr>
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<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>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>mengmeng.meng@intel.com
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>Driver/intel
</td>
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<th>Product</th>
<td>xorg
</td>
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<p>
<div>
<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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