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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 --- - [IVB/HSW/BYT-M bisected] lightsmark v2008 performance reduced ~30%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71523">71523</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>idr@freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[IVB/HSW/BYT-M bisected] lightsmark v2008 performance reduced ~30%
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jianx.zhou@intel.com
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/DRI/i965
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
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<pre>System Environment:
----------------------------------------------
Platform: HSW/BYT/IVB
Libdrm:(master)2.4.47-11-gda738d1ed0a0941a0c
Mesa:(master) git-a594cec
Xf86_video_intel:(master)2.99.905-102-g922a8bab89c1a59
Cairo:(master)56a195a76554abe1d5567c733ba679058fe01303
Kernel:(drm-intel-nightly) 164a4cb4c1431a0
Bug detailed description:
----------------------------------------------
lightsmark v2008 performance reduced ~30%. The problem exists on both
gnome-session and Raw X.
It’s Mesa regression, bisecting show that the first bad commit is:
59b01ca252bd6706f08cd80a864819d71dfe741c
Author: Fredrik H枚glund <<a href="mailto:fredrik@kde.org">fredrik@kde.org</a>>
Date: Tue Apr 9 20:54:25 2013 +0200
mesa: Add ARB_vertex_attrib_binding
update_array() and update_array_format() are changed to update the new
attrib and binding states, and the client arrays become derived state.
Reviewed-by: Eric Anholt <a href="mailto:eric@anholt.net">eric@anholt.net</a>
Performance
--------------------------------------------------------------------
Test lightsmark on ULT with Raw X
git-a594cec: 49.40
git-c6a3fb6: 75.68
Reproduce steps:
---------------------------------------------
1, xinit&
2. vblank_mode=0 ./backend silent 1920x1080</pre>
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