1758860 - 21.29% tabpaint (Windows) regression on Thu January 20 2022

Status: RESOLVED INVALID

(Core :: Web Painting, defect)

Description

[Alex Finder]

Perfherder has detected a talos performance regression from push 10f05d6ace0827313032d8886aeb6b3868320d15. 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)
21%	tabpaint	windows10-64-shippable-qr	e10s fission stylo webrender	46.52 -> 56.43
16%	tabpaint	windows10-64-shippable-qr	e10s fission stylo webrender	48.24 -> 55.84
11%	tabpaint	windows10-64-shippable-qr	e10s fission stylo webrender-sw	49.85 -> 55.22

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
7%	pdfpaint	windows10-64-shippable-qr	e10s fission stylo webrender	622.00 -> 581.38

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 1697979

Comment 2

[Miko Mynttinen]

Hi Alex, this regression range does not really make any sense, it is a backout of two bugs.

Comment 3

[Ryan VanderMeulen [:RyanVM]]

Looking at the graphs, it appears to me that there was an improvement around Jan 17 before "regressing" on Jan 20 back to where it was before (and remains to this day). From what I can see, there isn't a real regression to track here. Feel free to reopen if you disagree with that assessment.

Comment 4

[Ryan VanderMeulen [:RyanVM]]

Bug 1740499 fits that exactly, FWIW.