[Bug 109408] New: [Kabylake] RPS waitboost regression since v4.20
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Jan 21 21:58:57 UTC 2019
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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