1692441 - 2.65 - 21.54% allrecipes / amazon-search / ebay-kleinanzeigen / stackoverflow / wikipedia (android-hw-g5-7-0-arm7-api-16-shippable, android-hw-p2-8-0-android-aarch64-shippable, linux64-shippable) regression on push 9ab10a81eb56099cf471400400fa827a2359

Status: RESOLVED INVALID

(Core :: Layout: Grid, defect)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a browsertime performance regression from push 9ab10a81eb56099cf471400400fa827a2359f201. 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)
22%	ebay-kleinanzeigen	ContentfulSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	425.17 -> 516.75
8%	allrecipes	loadtime	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	1,761.21 -> 1,907.50
7%	amazon-search		android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm	478.56 -> 513.52
7%	allrecipes	loadtime	android-hw-g5-7-0-arm7-api-16-shippable	nocondprof warm	4,794.25 -> 5,133.21
7%	stackoverflow	ContentfulSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	310.42 -> 332.33
7%	stackoverflow	FirstVisualChange	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	310.42 -> 332.33
7%	stackoverflow	LastVisualChange	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	310.42 -> 332.33
7%	stackoverflow	PerceptualSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	310.42 -> 332.33
7%	stackoverflow	SpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	nocondprof warm webrender	310.42 -> 332.33
3%	wikipedia	LastVisualChange	linux64-shippable	nocondprof warm	1,130.00 -> 1,160.00

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 1527734

Comment 2

[Ting-Yu Lin [:TYLin] (PST, UTC-7)]

I'm looking at related graphs in https://treeherder.mozilla.org/perfherder/alerts?id=28703, such as

• https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,2892231,1,13
• https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,2892236,1,13
• https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,2890624,1,13

It seems the graph jumps from this push.

Florin, could you double-check the range that causes the regression?

Comment 3

[Florin Strugariu [:Bebe]]

Graphs are very noisy and unusable
https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,2892231,1,13
https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,2892236,1,13

for this one I made some backfills to check what's happening
https://treeherder.mozilla.org/perfherder/graphs?timerange=1209600&series=autoland,2890624,1,13

Also I will do some more backfills to re check this alert

Comment 4

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

Seems to me like revision bd2b705457a3 - Bug 1691160 is the culprit in this case. I did another round of retriggers and I'll update the bug accordingly.

Comment 5

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

Alert reassigned to alert 28763