1389498 - 1.8 - 3.07% tscrollx (linux64) regression on push 01fd73e4b8b89080505bf9f004c82c3e1043f40e (Thu Aug 10 2017)

Status: RESOLVED FIXED

(Core :: DOM: Content Processes, defect)

Description

[Ionuț Goldan [:igoldan]]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?changeset=01fd73e4b8b89080505bf9f004c82c3e1043f40e

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

Regressions:

  3%  tscrollx summary linux64 pgo e10s     4.40 -> 4.53
  2%  tscrollx summary linux64 opt e10s     4.46 -> 4.54


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=8705

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]]

Bill, I see you are the owner of bug 1384336. Can we improve these regressions or should we accept them?

Comment 2

[Bill McCloskey [inactive unless it's an emergency] (:billm)]

I'd like to investigate this, but I probably won't get to it for a week or two. The regression is not very serious from what I can see, so I think it can wait. I'll leave the needinfo on me.

Comment 3

[Andrew McCreight [:mccr8]]

Fixed by backout (see bug 1400855).