1687238 - 22.17 - 24.73% tsvg_static (linux64-shippable-qr) regression on push ebc2ea295bd6b2a6fc064af730145e9b8d2b5f2c (Thu January 14 2021)

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect)

Description

[Alexandru Ionescu (needinfo me) [:alexandrui]]

Perfherder has detected a talos performance regression from push ebc2ea295bd6b2a6fc064af730145e9b8d2b5f2c. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Suite	Test	Platform	Options	Absolute values (old vs new)
25%	tsvg_static		linux64-shippable-qr	e10s stylo webrender-sw	39.25 -> 48.95
22%	tsvg_static		linux64-shippable-qr	e10s stylo webrender-sw	40.18 -> 49.09

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

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

Set release status flags based on info from the regressing bug 1684170

Comment 2

[Jim Mathies [:jimm]]

Wondering if this is a real regression or something related to CI running the wrong options?

Comment 3

[Jim Mathies [:jimm]]

It's entirely possible we were not getting software fallback for these runs prior to the parent bug landing. Andrew will take a look to confirm.

Comment 4

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

I pushed a patch to try to confirm what configuration we are running as.

before bug 1684170: https://treeherder.mozilla.org/#/jobs?repo=try&revision=74228b09fe799121537955a034ce09c18dedb5df
after bug 1684170: https://treeherder.mozilla.org/jobs?repo=try&revision=85a6db37176da6baad411fa860c3aad421a30cc5

Comment 5

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

The configuration seems to be identical, nothing changed. Bug 1684625 did land the day prior and caused a small regression at the time.