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

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

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.

Fixed by backout (see bug 1400855).