1697370 - 69.56 - 143.89% cnn-ampstories ContentfulSpeedIndex / cnn-ampstories FirstVisualChange / cnn-ampstories fcp (android-hw-p2-8-0-android-aarch64-shippable) regression on push 0fc57efb08a00fc1e4a84d8112d99241ddb75c4a (Fri March 5 2021)

Status: RESOLVED WONTFIX

(Testing :: Performance, defect)

Description

[Ionuț Goldan [:igoldan]]

Perfherder has detected a browsertime performance regression from push 0fc57efb08a00fc1e4a84d8112d99241ddb75c4a. 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)
144%	cnn-ampstories	fcp	android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	634.29 -> 1,547.00
105%	cnn-ampstories	FirstVisualChange	android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	894.54 -> 1,836.50
73%	cnn-ampstories		android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	366.09 -> 633.14
70%	cnn-ampstories	ContentfulSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	1,084.50 -> 1,838.83
62%	cnn-ampstories	LastVisualChange	android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	1,194.50 -> 1,933.08
61%	cnn-ampstories	SpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	1,165.54 -> 1,880.25
61%	cnn-ampstories	PerceptualSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	cold live nocondprof webrender	1,168.00 -> 1,881.75

Improvements:

Ratio	Suite	Test	Platform	Options	Absolute values (old vs new)
20%	cnn-ampstories	fcp	android-hw-g5-7-0-arm7-api-16-shippable	cold live nocondprof webrender	2,444.10 -> 1,949.58
16%	cnn-ampstories	SpeedIndex	android-hw-g5-7-0-arm7-api-16-shippable	cold live nocondprof webrender	3,170.58 -> 2,660.67

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

[Ionuț Goldan [:igoldan]]

These tests are all tier 3. Once bug 1570906 lands, they won't generate alerts anymore, because of their instability.