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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 --- - [HSW ULT/IVB]FBC poor management when running video workload"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65396">65396</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>gordon.jin@intel.com, lianyuex.yang@intel.com, ouping.zhang@intel.com, tienan.liu@intel.com
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[HSW ULT/IVB]FBC poor management when running video workload
</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>tienan.liu@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: HSW-ult\IVB
Libdrm: (master)libdrm-2.4.45-3-
g3586337f3703ce4833a375f66b08df064a1cec28
Mesa: (master)f6beb4c6b647b0d5077c7abd6c99cdaba6e0c112
Xserver: (master)xorg-server-1.14.99.1-82-
g7e97166c4fc38076b6224e4dbdd632b43444149f
Xf86_video_intel:
(master)2.21.6-47-gd6c30d1d4df6bcdfa075bd29da7c8aabee20774c
Cairo: (master)631bf299256e11a17511977f357e0353fb5615f7
Libva:
(staging)880c916092c6d68096c95e49405714d8a21f9322
Libva_intel_driver: (staging)0a5cfdab47c788569feb0a3e4293906687523f88
Kernel: (drm-intel-nightly)
675fa342aa3a54af0a81f23809fff9590dfb6fc1
Test result:
----------------------------------------
HSW-ult FBC disable Average_watt FBC enable Average_watt
idle 14.8 14.7
browser 17.9 17.8
video 18.7 18.6
game 21 21
IVB FBC disable Average_watt FBC enable Average_watt
idle 28 27.8
browser 32.5 32.1
video 31.6 32
game 34.8 34.7
Findings:
----------------------------------------
on HSW, FBC saved 0.1w running idle/browser/video workloads, but did not save
any power when running game workload.
on IVB, FBC saved 0.2w on idle, 0.4w on browser, 0.1w on game, but FBC cost
more 0.4w power when running video workload.</pre>
</div>
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