1748429 - 13.32 - 5.65% a11yr dhtml.html / perf_reftest_singletons bidi-resolution-1.html + 4 more (Linux, OSX, Windows) regression on Fri December 31 2021

Status: RESOLVED WONTFIX

(Core :: DOM: Navigation, defect)

Description

[Andra Esanu (needinfo me)]

Perfherder has detected a talos performance regression from push 90a3cf1104389a262f75d6fb844eb2f7049b3d34. 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)
13%	a11yr dhtml.html	windows10-64-shippable-qr	e10s fission stylo webrender	319.76 -> 362.36
11%	perf_reftest_singletons style-sharing.html	linux1804-64-shippable-qr	e10s fission stylo webrender	4.79 -> 5.34
11%	perf_reftest_singletons style-sharing-style-attr.html	linux1804-64-shippable-qr	e10s fission stylo webrender	4.76 -> 5.27
10%	perf_reftest_singletons style-sharing-style-attr.html	linux1804-64-shippable-qr	e10s fission stylo webrender	4.78 -> 5.28
7%	perf_reftest_singletons style-sharing-style-attr.html	macosx1014-64-shippable-qr	e10s fission stylo webrender	4.75 -> 5.09
6%	perf_reftest_singletons bidi-resolution-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender	147.50 -> 155.83

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
63%	tp5o responsiveness	windows10-64-shippable-qr	e10s fission stylo webrender	1.54 -> 0.57
51%	tp5o responsiveness	linux1804-64-shippable-qr	e10s fission stylo webrender	5.13 -> 2.53
41%	tp5o_webext responsiveness	windows10-64-shippable-qr	e10s fission stylo webrender	2.09 -> 1.23
36%	tp5o_webext responsiveness	linux1804-64-shippable-qr	e10s fission stylo webrender	6.80 -> 4.39
19%	tsvg_static	macosx1014-64-shippable-qr	e10s fission stylo webrender	65.12 -> 52.92
...	...	...	...	...
4%	tsvgx	macosx1015-64-shippable-qr	e10s fission stylo webrender	141.90 -> 135.83

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

[Olli Pettay [:smaug][[e-mail]]]

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=90a3cf1104389a262f75d6fb844eb2f7049b3d34 is something we really have to do, so I don't think we can really do anything here. And luckily the improvements look rather great.