1439528 - 4.7% tp5o_webext responsiveness (linux64) regression on push b3ee97dce95a8d672f6a7445a132389cfeeb53eb (Fri Feb 16 2018)

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Ionuț Goldan [:igoldan]]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?changeset=b3ee97dce95a8d672f6a7445a132389cfeeb53eb

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

Regressions:

  5%  tp5o_webext responsiveness linux64 opt e10s stylo     1.92 -> 2.01


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=11635

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 Talos jobs in a pushlog format.

To learn more about the regressing test(s), please see: https://wiki.mozilla.org/Buildbot/Talos/Tests

For information on reproducing and debugging the regression, either on try or locally, see: https://wiki.mozilla.org/Buildbot/Talos/Running

*** 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/Buildbot/Talos/RegressionBugsHandling

Comment 1

[Ionuț Goldan [:igoldan]]

:jorendorff This regression happens only on Linux x64's OPT builds. Equivalent PGO build isn't affected and neither any other platform. I'd say we can resolve this as WONTFIX unless you know there's something real about this.