1550433 - 3.63% raptor-tp6-slides-firefox fcp (linux64-shippable-qr) regression on push c078e2cefc3b86e17f1495c13a33aa58dc26be06 (Fri May 3 2019)

Status: NEW

(Core :: XPCOM, defect)

Description

[Florin Strugariu [:Bebe]]

Raptor has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=c078e2cefc3b86e17f1495c13a33aa58dc26be06

As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

4% raptor-tp6-slides-firefox fcp linux64-shippable-qr opt 755.62 -> 783.04

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=20817

On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a Treeherder page showing the Raptor jobs in a pushlog format.

To learn more about the regressing test(s) or reproducing them, please see: https://wiki.mozilla.org/Performance_sheriffing/Raptor

*** Please let us know your plans within 3 business days, or the offending patch(es) will be backed out! ***

Our wiki page outlines the common responses and expectations: https://wiki.mozilla.org/Performance_sheriffing/Talos/RegressionBugsHandling

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

Lovely. Because of https://bugzilla.mozilla.org/show_bug.cgi?id=1543806, this kinds of regressions, or improvements can happen somewhat randomly when changing CC or GC scheduling.
Though, I guess CC might happen there too.
But we really need bug 1543806 fixed.