1839620 - 4.81 - 4.27% stylebench / stylebench (Windows) regression on Thu June 8 2023

Status: NEW

(Core :: CSS Parsing and Computation, defect)

Description

[Andra Esanu (needinfo me)]

Perfherder has detected a browsertime performance regression from push b78c7333f0fdf9378eaf33b8ff1b60f4a9a69378. 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)	Performance Profiles
5%	stylebench	windows10-64-shippable-qr	fission webrender	54.87 -> 52.23	Before/After
4%	stylebench	windows10-64-shippable-qr	fission webrender	54.99 -> 52.64	Before/After

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
5%	dailymail LastVisualChange	android-hw-a51-11-0-aarch64-shippable-qr	warm webrender	1,725.98 -> 1,641.37

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 1835923

Comment 2

[Emilio Cobos Álvarez (:emilio)]

Yeah this is expected, bug 1836948 would improve back.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1835923

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:dholbert, could you have a look please?

For more information, please visit BugBot documentation.

Comment 5

[Daniel Holbert [:dholbert]]

Triaging as S3 given comment 2.