Alison Shiue Reporter
	Description • 8 years ago

Talos has detected a Firefox performance regression from push 649c62d13b57bf6966bc70f4da603d52c92070de. As author of one of the patches included in that push, we need your help to address this regression.

Summary of tests that regressed:

  damp summary osx-10-10 opt: 300.69 -> 320.35 (6.54% worse)
  tart summary windows7-32 opt: 6.21 -> 6.36 (2.43% worse)
  damp summary windows7-32 opt: 318.13 -> 334.57 (5.17% worse)
  tart summary windows8-64 opt: 5.68 -> 5.87 (3.47% worse)
  damp summary windows8-64 opt: 303.64 -> 324.12 (6.75% worse)
  damp summary windows7-32 opt e10s: 266.89 -> 282.48 (5.84% worse)
  tps summary windows8-64 opt: 69.23 -> 70.7 (2.13% worse)


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=2704

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

	Alison Shiue Reporter
	Comment 1 • 8 years ago

After doing some retriggers, this issue might be caused by one of following patches:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=f7de27ec1079a5b4029292e6589c72463db85b0d&tochange=649c62d13b57bf6966bc70f4da603d52c92070de

Hi Olli, as you are the patch author, can you take a look at this and determine what is the root cause? Thanks!

	Olli Pettay [:smaug][bugs@pettay.fi] Assignee
	Comment 2 • 8 years ago

Please back out bug 1297367.

	Ryan VanderMeulen [:RyanVM]
	Comment 3 • 8 years ago

Bug 1297367 backed out.

	Joel Maher ( :jmaher ) (UTC -8)
	Comment 4 • 8 years ago

thanks Ryan!