<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Kabylake] RPS waitboost regression since v4.20"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109408">109408</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[Kabylake] RPS waitboost regression since v4.20
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lyude@redhat.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Since v4.20, it seems that the i915 hasn't been waitboosting the GPU frequently
enough to prevent shell animations in gnome-shell from stuttering where on 4.19
I don't seem to have any issues.
Continuously opening and closing the activies overlay with gnome-shell on v4.19
seems to keep the GPU on my laptop around an 800-1000 MHz RPS boost:
RPS enabled? 1
GPU busy? yes [1 requests]
CPU waiting? 1
Boosts outstanding? 0
Interactive? 1
Frequency requested 983
min hard:300, soft:300; max soft:1050, hard:1050
idle:300, efficient:300, boost:1050
systemd-logind [789]: 55 boosts
Xwayland [5962]: 1 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Xwayland [5962]: 0 boosts
Kernel (anonymous) boosts: 63
RPS Autotuning (current "high power" window):
Avg. up: 100% [above threshold? 85%]
Avg. down: 67% [below threshold? 60%]
While v4.20 and higher seem to only boost the GPU briefly under load, then fall
back to around 300MHz:
(taken from 5.0.0-0.rc2)
RPS enabled? 1
GPU busy? yes [2 requests]
CPU waiting? 0
Boosts outstanding? 0
Interactive? 1
Frequency requested 317, actual 317
min hard:300, soft:300; max soft:1050, hard:1050
idle:300, efficient:300, boost:1050
systemd-logind [909]: 26 boosts
Xwayland [1814]: 1 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Xwayland [1814]: 0 boosts
Kernel (anonymous) boosts: 67
RPS Autotuning (current "high power" window):
Avg. up: 3% [above threshold? 85%]
Avg. down: 47% [below threshold? 60%]
Stuttering observed with gnome-shell 3.20.2 on Fedora 29, worked fine on kernel
v4.19.15. Display configuration is a single built-in 4K LCD, with a Kabylake
H620:
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 620
[8086:5916] (rev 02)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the QA Contact for the bug.</li>
</ul>
</body>
</html>