1780426 - 5.17% cnn SpeedIndex (OSX) regression on Fri July 8 2022

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect, P2)

Description

[Alex Finder-PTO|back on Sept 16th]

Perfherder has detected a browsertime performance regression from push 84c72c2fbfd6dd1d9ec0cf9fa683ddc2b6e3fa1b. 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)
5%	cnn SpeedIndex	macosx1015-64-shippable-qr	cold fission webrender	879.56 -> 925.07

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.

If you need the profiling jobs you can trigger them yourself from treeherder job view or ask a sheriff to do that for you.

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 1776205

Comment 2

[Nicolas B. Pierron [:nbp]]

The weird thing is that the reason why I made the previous patch was to improve cnn result once Bug 1779292 would land …
Thus apparently we cannot have improvement when each patch is landed in a standalone fashion …

Feel free to back it out …
You will have to backout Bug 1776668 as well.

Comment 3

[Dianna Smith [:diannaS]]

Marked as Fixed in 104 by backout of bug 1776668 and bug 1776205
https://treeherder.mozilla.org/#/jobs?repo=mozilla-beta&revision=3e332ff112a8916123cd00293d690131306f363f

Comment 4

[Dianna Smith [:diannaS]]

Marked as Fixed in 105 by backout of bug 1776668 and bug 1776205