1688826 - 3.28 - 6.92% Explicit Memory / Heap Unclassified (linux1804-64-shippable-qr) regression on push a62f91b0e206da21431fb2f1938e141169297f82 (Wed January 20 2021)

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a awsy performance regression from push a62f91b0e206da21431fb2f1938e141169297f82. 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)
7%	Heap Unclassified		linux1804-64-shippable-qr		258,540,601.92 -> 276,429,283.24
5%	Heap Unclassified		linux1804-64-shippable-qr	tp6	227,507,639.97 -> 238,793,428.20
3%	Explicit Memory		linux1804-64-shippable-qr		567,204,303.98 -> 585,808,490.13

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

[Jamie Nicol [:jnicol]]

This patch was unfortunately required to revert bug 1685563 due to some driver bugs causing rendering issues. So it just undoes the wins the original patch gained. I'm working to resolve those issues so that we can reland it again. In the meantime please don't back out this change, otherwise we will run in to those rendering issues.