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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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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 bisected]x11perf performance reduced by 40%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=62710">62710</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[IVB bisected]x11perf performance reduced by 40%
</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>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mengmeng.meng@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>System Environment:
--------------------------
Platform:IVB
Libdrm: (master)libdrm-2.4.42-7-g36a2daad2416ad55a859c483b0d7ed93a5eff6e0
Mesa: (9.1)e6616948b74531eae3137585b3ae35a1fc0f8174
Xserver:(server-1.13-branch)xorg-server-1.13.3
Xf86_video_intel:(master)2.21.5-1-g9f8e86800345d19785eae2dd2099dd7d61a7a3b3
Kernel: (drm-intel-fixes) c12aba5aa0e60b7947bc8b6ea25ef55c4acf81a4
Bug detailed description:
-----------------------------
x11perf performance reduced by 40% on IVB. The problem exists on both xinit and
gnome-session. It's kernel regression, by bisected show 3b4f819d5eac94ba8fe5 is
the first bad commit.
commit 3b4f819d5eac94ba8fe5e8c061f6dabfe8d7b22c
Author: Takashi Iwai <<a href="mailto:tiwai@suse.de">tiwai@suse.de</a>>
Date: Mon Mar 11 18:40:16 2013 +0100
Revert "drm/i915: try to train DP even harder"
Performance data
-------------------
x11perf -aa10text on IVB.
gnome-session xinit
good(3118a) 3620000.0/sec 4230000.0/sec
bad(3b4f81) 2300000.0/sec 2480000.0/sec
Reproduce steps:
----------------------------
1, xinit&
2, vblank_mode=0 x11perf -aa10text</pre>
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