1820034 - 4.9% tp5o_scroll (Linux) regression on Mon February 27 2023

Status: RESOLVED WONTFIX

(Core :: Graphics, defect)

Description

[Andrej (:aglavic)]

Perfherder has detected a talos performance regression from push f2cee2116b0b864dc0d243846e1e7eb40464611b. 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%	tp5o_scroll	linux1804-64-shippable-qr	e10s fission stylo webrender	2.63 -> 2.76

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
39%	glterrain	linux1804-64-qr	e10s fission stylo webgl-ipc webrender	3.70 -> 2.24
39%	glterrain	linux1804-64-shippable-qr	e10s fission stylo webgl-ipc webrender	3.63 -> 2.23
38%	glterrain	linux1804-64-shippable-qr	e10s fission stylo webgl-ipc webrender	3.63 -> 2.24
38%	glterrain	linux1804-64-shippable-qr	e10s fission stylo webrender	3.62 -> 2.25

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 1818992

Comment 2

[Andrew Osmond [:aosmond] (he/him)]

Generally we expect/know EGL to have real world performance improvements for users. This in addition to the anticipated stability benefits garnered from moving away from GLX. There may be some benchmarks that regress but I am willing to sign off on that.