1729296 - 27.76 - 24.96% twinopen ext+twinopen:twinopen.html / twinopen ext+twinopen:twinopen.html + 2 more (Linux) regression on Thu September 2 2021

Status: RESOLVED FIXED

(Core :: XPCOM, defect)

Description

[Andra Esanu (needinfo me)]

Perfherder has detected a talos performance regression from push 14abef8826d0c8d5d8bfdc7bfd9c081b02dc59de. 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)
28%	twinopen ext+twinopen:twinopen.html	linux1804-64-shippable-qr	e10s stylo webrender-sw	93.65 -> 119.66
26%	twinopen ext+twinopen:twinopen.html	linux1804-64-shippable-qr	e10s fission stylo webrender	108.37 -> 136.96
25%	twinopen ext+twinopen:twinopen.html	linux1804-64-shippable-qr	e10s fission stylo webrender	109.17 -> 136.55
25%	twinopen ext+twinopen:twinopen.html	linux1804-64-shippable-qr	e10s stylo webrender	105.47 -> 131.79

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

[Paul Bone [:pbone]]

I can't see the perf differences because of Bug 1729057.

Comment 2

[Ryan VanderMeulen [:RyanVM]]

Hi Paul, I believe the bug from comment 1 is fixed now. Can you please take another look?

Comment 3

[Mathew Hodson]

Fixed in Firefox 94 by backout https://hg.mozilla.org/mozilla-central/rev/0f3c29b12e5b

Comment 4

[Marco Castelluccio [:marco]]

Set release status flags based on info from the regressing bug 1727960