[Bug 109408] New: [Kabylake] RPS waitboost regression since v4.20

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109408

            Bug ID: 109408
           Summary: [Kabylake] RPS waitboost regression since v4.20
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lyude at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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)

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