1794765 - 8.59% perf_reftest_singletons line-iterator.html (Windows) regression on Sat October 8 2022

Status: RESOLVED INVALID

(Core :: Layout: Block and Inline, defect)

Description

[Andrej (:aglavic)]

Perfherder has detected a talos performance regression from push c4a4f6e023263353c0886210ad677d07f45d7047. 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)
9%	perf_reftest_singletons line-iterator.html	windows10-64-shippable-qr	e10s fission stylo webrender	902.01 -> 981.30
9%	perf_reftest_singletons line-iterator.html	linux1804-64-shippable-qr	e10s fission stylo webrender	917.20 -> 997.69
9%	perf_reftest_singletons line-iterator.html	windows10-64-shippable-qr	e10s fission stylo webrender	903.03 -> 980.56

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 1793390

Comment 2

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)(away until 10/14)]

It's intentional change. The fix of bug 1789967 caused making a half of the test do nothing. Therefore, the score was improved. However, the fix of bug 1793390 makes the test runs same things again. Therefore, the score becomes worse.

Comment 3

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)(away until 10/14)]

Oh, but anyway, the scores are much improved from the builds before the fix of bug 1789967.