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      <base href="https://bugs.freedesktop.org/">
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    <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>


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