1398464 - 6.09 - 32.32% sessionrestore_many_windows (osx-10-10, windows10-64, windows7-32) regression on push 39a94e16a3694c443a985081ac1c6cd761363da2 (Fri Sep 8 2017)

Status: RESOLVED FIXED

(Firefox :: Session Restore, defect)

Description

[Joel Maher ( :jmaher ) (UTC -8)]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=39a94e16a3694c443a985081ac1c6cd761363da2

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

Regressions:

 32%  sessionrestore_many_windows windows10-64 opt e10s     3,034.50 -> 4,015.33
 31%  sessionrestore_many_windows windows7-32 opt e10s      3,168.58 -> 4,144.17
  6%  sessionrestore_many_windows osx-10-10 opt e10s        2,990.67 -> 3,172.92


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=9333

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

[Joel Maher ( :jmaher ) (UTC -8)]

:beekill, can you look into this large regression in our performance test?

Comment 2

[Mike de Boer [:mikedeboer]]

Resolved by backout of the offending changeset.