1802528 - 5.33% motionmark-htmlsuite (OSX) regression on Wed November 16 2022

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect)

Description

[Alex Finder]

Perfherder has detected a browsertime performance regression from push 75abe5b4a98711c850a3cfa8e7537c3de80a19fb. 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%	motionmark-htmlsuite	macosx1015-64-shippable-qr	fission webrender	59.70 -> 56.51

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 1799425

Comment 2

[Emilio Cobos Álvarez (:emilio)]

But I'm confuse, the pushlog points to Masayuki's patches?

Comment 3

[Timothy Nikkel (:tnikkel)]

There's a big gap in pushes that don't have results for this metric. The pushlog for this regression should be

https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=83b3be21d0fb56db21e74f0511ae80f47d9eb5cf&tochange=75abe5b4a98711c850a3cfa8e7537c3de80a19fb

Comment 4

[Timothy Nikkel (:tnikkel)]

I tried to add jobs to all the pushes in that range but it seemed to not actually add the jobs despite the "add-new" job succeeding.

I pushed to try. Bug 1799425 is indeed responsible.

The CSS bouncing blend circles opt fission webrender subtest is the one that regresses.

Bug 1799425 only tweeks a flag that is only looked at inside of webrender, so passing the needinfo on to Glenn.

Comment 5

[Glenn Watson [:gw]]

There's nothing we can really do here, the patch may involve some extra GPU work on some pages, but it's a fix for incorrect rendering that's needed.