1302031 - 8.18 - 12.16% a11yr (windows7-32, windows8-64) regression on push 94d0169e939509680f714fb055a43e4e0e7d1e99 (Fri Sep 9 2016)

Status: RESOLVED DUPLICATE of bug 1296571

(Firefox :: Untriaged, defect)

Description

[Alison Shiue]

Talos has detected a Firefox performance regression from push 94d0169e939509680f714fb055a43e4e0e7d1e99. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

 12%  a11yr summary windows8-64 pgo e10s     4294.14 -> 4816.15
 10%  a11yr summary windows8-64 opt e10s     4583.67 -> 5043.8
  8%  a11yr summary windows7-32 opt e10s     4078.79 -> 4412.35


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=3039

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

[Alison Shiue]

After doing some retriggers, this issue might be caused by one of following patches:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=91f2899d469fdda8f114002fa5a5faf1f7023084&tochange=94d0169e939509680f714fb055a43e4e0e7d1e99

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

Comment 2

[(No longer employed by Mozilla) Aaron Klotz]

Not much to be done here. These scores were already much higher than we wanted for release before these patches landed. Perf optimization work is ongoing and will be blocking bug 1296571, so I am going to dup this over there.

Comment 3

[David Bolter [:davidb] (NeedInfo me for attention)]

Updating 51 status to reflect bug 1296571 comment 7.