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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 --- - [BDW Bisected] etqw-demo/lightsmark/warsow01/unigine-demos/Synmark2_v6/GLBenchmarkv2.5.1/v2.7.0 performance reduced 10%~50%"
href="https://bugs.freedesktop.org/show_bug.cgi?id=81986">81986</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BDW Bisected] etqw-demo/lightsmark/warsow01/unigine-demos/Synmark2_v6/GLBenchmarkv2.5.1/v2.7.0 performance reduced 10%~50%
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-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>
<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>Environment:
----------------------------------------------
Platform: BDW
Libdrm: (master)libdrm-2.4.56
Mesa: (master)66decc7efa08ae9c94e4bd11038cfe8b3132d554
Xserver:
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel: (master)2.99.914-8-ga88795c64123e4084044451d8861838ea904abd9
Cairo: (master)f337342c88092a251dc00476c4a9880d1cb90822
Libva: (master)3fddb7f937df4e0e15391bd65ae3c7552ea5b3d7
Libva_intel_driver: (master)82d2ed8d7da3619c0ea467c06604f5626fc0b901
Kernel: (drm-intel-nightly) git-eb2af9
Bug detailed description:
---------------------------------------------------
etqw-demo/lightsmark/warsow01/unigine
demos/GLBenchmark_2.5.1/GLBenchmark_v2.7.0/3DMMES2_taiji/
hoverjet/Synmark2_v6_(OglFillTexMulti/OglPSBump2/OglPSBump8/OglPSPhong/OglPSPom/OglShMapPcf/
OglShMapVsm/OglTexFilterTri/OglTexMem128/OglTexMem512/OglDeferred) performance
reduced 10%~50%.
This problem doesn’t exist on IVB/BYT-M/HSW, The problem exists both on
gnome-session and Raw X.
BTW, after revert bad commit, it can works well.
It’s Kernel(drm-intel-next-queued) regression, bisecting show that the first
bad commit is: 66bc2cab191816d931f4d660d2f162130dd202b2
Author: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
AuthorDate: Wed Jul 16 17:49:30 2014 -0300
Commit: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
CommitDate: Wed Jul 23 07:05:37 2014 +0200
drm/i915: BDW can also detect unclaimed registers
Reproduce steps:
---------------------------------------------
1. xinit&
2. vblank_mode=0 ./backend silent 1920x1080</pre>
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