Closed Bug 1379613 Opened 7 years ago Closed 7 years ago

19.34% sessionrestore_many_windows (windows10-64) regression on push bb672269322d4b764ec0c1b8fad13b57f3939b5b (Fri Jul 7 2017)


(Firefox :: Theme, defect)

Windows 10
Not set



Tracking Status
firefox54 --- unaffected
firefox55 --- unaffected
firefox56 --- affected


(Reporter: igoldan, Unassigned)



(Keywords: perf, regression, talos-regression)

Talos has detected a Firefox performance regression from push:

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


 19%  sessionrestore_many_windows windows10-64 opt e10s     3,676.91 -> 4,387.92

You can find links to graphs and comparison views for each of the above tests at:

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:

For information on reproducing and debugging the regression, either on try or locally, see:

*** 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:
::dao This is a Windows 10-only issue, an only affects its OPT builds; the related PGO doesn't appear to be affected at all. This surely requires at least an investigation, if not a fix.
Flags: needinfo?(dao+bmo)
I can't explain this and don't know how we could undo the regression. Anyway, this is the reversal of bug 1196266 comment 67 and as such I think it's wontfix.
Closed: 7 years ago
Flags: needinfo?(dao+bmo)
Resolution: --- → WONTFIX
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