1756556 - 653.82 - 303.6% cnn-ampstories fcp / cnn-ampstories fcp + 1 more (Android) regression on Sun February 20 2022

Status: RESOLVED FIXED

(Core :: Networking: HTTP, defect)

Description

[Alex Finder]

Perfherder has detected a browsertime performance regression from push a04a58abafff63875b03eee1f4a05a8f94c3f11e. 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)
654%	cnn-ampstories fcp	android-hw-g5-7-0-arm7-shippable-qr	warm webrender	1,104.29 -> 8,324.33
646%	cnn-ampstories fcp	android-hw-g5-7-0-arm7-shippable-qr	warm webrender	1,116.42 -> 8,324.62
304%	cnn-ampstories fcp	android-hw-g5-7-0-arm7-shippable-qr	cold webrender	2,320.08 -> 9,363.96

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
48%	cnn-ampstories loadtime	android-hw-g5-7-0-arm7-shippable-qr	warm webrender	600.75 -> 309.96
26%	cnn-ampstories loadtime	android-hw-g5-7-0-arm7-shippable-qr	cold webrender	2,498.15 -> 1,841.62

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 1675054

Comment 2

[Cristian Tuns]

The Bug 1675054 was backed out for causing this regression. https://hg.mozilla.org/mozilla-central/rev/a5e46f03df3b8fe039a15de151ba72b4739e546a

Comment 3

[Valentin Gosu [:valentin]]

I'll make sure to investigate this before landing Bug 1675054.