<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<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]Lightsmark performance reduced by 9%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=57830">57830</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[IVB bisected]Lightsmark performance reduced by 9%
</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>yex.tian@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>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>System Environment:
----------------------------------------------
Platform:IVB
Libdrm: (master)libdrm-2.4.40-3-g0980633afd9c7eecc0c75ef3bea4d3c6b7aa1898
Mesa: (9.0)d0a9ab29b2c8abf2900b1095883cba71b05b5cd9
Xserver:(server-1.13-branch)xorg-server-1.13.0.901
Kernel: (drm-intel-fixes)7b01e260a6cad9152eefb44ce64f3a2073af1e6b
Bug detailed description:
----------------------------------------------
Lightsmark performance reduced by ~9% only on IVB.
It's Kernel regression. By bisected, show that 61939d9 is the first bad commit.
commit 61939d977d66951b04cfd4fbe75705614b98ecad
Author: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Date: Tue Oct 2 17:43:38 2012 -0500
drm/i915: implement WaForceL3Serialization on VLV and IVB
Performance:
-----------------------------------------------
ff1f525 is 61939d9 parents commit.
61939d9 ff1f525 61939d9 vs. ff1f525
xinit 77 71 9%
gnome-session 83 77 9%
Reproduce steps:
---------------------------------------------
1, xinit&
2, vblank_mode=0 ./backend silent 1920x1080</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>