1857250 - 6.48 - 3.1% wikipedia LastVisualChange / wikipedia loadtime + 1 more (OSX) regression on Tue October 3 2023

Status: RESOLVED WORKSFORME

(Core :: Memory Allocator, defect)

Description

[Andra Esanu (needinfo me)]

Perfherder has detected a browsertime performance regression from push 61ad519d5807c61d77b094f7decb56102cf8f844. 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)	Performance Profiles
6%	wikipedia LastVisualChange	macosx1015-64-shippable-qr	bytecode-cached fission warm webrender	867.99 -> 924.28	Before/After
4%	wikipedia LastVisualChange	macosx1015-64-shippable-qr	bytecode-cached fission warm webrender	872.13 -> 909.13	Before/After
3%	wikipedia loadtime	macosx1015-64-shippable-qr	bytecode-cached fission warm webrender	353.98 -> 364.96	Before/After

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) may be backed out in accordance with our regression policy.

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Comment 1

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

Set release status flags based on info from the regressing bug 1856268

Comment 2

[Paul Bone [:pbone]]

This is expected. it restores correct behaviour. See https://bugzilla.mozilla.org/show_bug.cgi?id=1814798#c8 which is the perf improving due to a bug.

WORKSFORME because this is correct.