1760638 - 2-8% tabswitch, tart regression on Tue March 15 2022

Status: RESOLVED WONTFIX

(Core :: Web Painting, defect)

Description

[Andrej (:aglavic)]

Perfherder has detected a talos performance regression from push 65c2623a2d3567002f440a0704b9b7b2b03d7115. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
8%	tart	windows10-64-shippable-qr	e10s fission stylo webrender-sw	2.61 -> 2.82
6%	tart	windows10-64-shippable-qr	e10s fission stylo webrender	2.69 -> 2.87
6%	tabswitch	linux1804-64-shippable-qr	e10s fission stylo webrender	6.83 -> 7.21
5%	tabswitch	windows10-64-shippable-qr	e10s fission stylo webrender	7.43 -> 7.80
4%	tabswitch	windows10-64-shippable-qr	e10s fission stylo webrender-sw	7.42 -> 7.74
2%	tart	macosx1015-64-shippable-qr	e10s fission stylo webrender-sw	2.03 -> 2.08

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
19%	displaylist_mutate	windows10-64-shippable-qr	e10s fission stylo webrender-sw	2,998.16 -> 2,419.42
19%	displaylist_mutate	macosx1015-64-shippable-qr	e10s fission stylo webrender-sw	2,219.57 -> 1,791.60
19%	displaylist_mutate	macosx1015-64-shippable-qr	e10s fission stylo webrender-sw	2,191.80 -> 1,770.35
19%	displaylist_mutate	macosx1015-64-shippable-qr	e10s fission stylo webrender	2,180.52 -> 1,771.87
17%	displaylist_mutate	windows10-64-shippable-qr	e10s fission stylo webrender	2,983.36 -> 2,472.44
...	...	...	...	...
11%	about_preferences_basic	windows10-64-shippable-qr	e10s fission stylo webrender-sw	120.20 -> 107.33

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1759514

Comment 2

[Miko Mynttinen]

Same as bug 1760282, this is the previous baseline after Nightly only pref was flipped off.