Closed Bug 1371240 Opened 2 years ago Closed 2 years ago

2.27 - 2.4% kraken (linux64) regression on push 514cd61f92a0970ba495ffe39f0252b50bd8d4ea (Wed Jun 7 2017)


(Core :: JavaScript Engine, defect)

53 Branch
Not set





(Reporter: jmaher, 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.


  2%  kraken summary linux64 pgo e10s     1,478.16 -> 1,513.61
  2%  kraken summary linux64 opt e10s     1,530.01 -> 1,564.81

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:
:jandem, I see you are the patch author of bug 1370823 which is looking like the patch which caused this regression.  Can you take a look at this and help determine if this is expected or if not expected propose a fix or recommend accepting the regression?
Component: Untriaged → JavaScript Engine
Flags: needinfo?(jdemooij)
Product: Firefox → Core
What's happening is probably that we no longer evict the nursery in NukeCrossCompartmentWrappers when we reload the test iframe, but we now happen to do it during one of the tests. There's not much we can do about it - in general not evicting the nursery is a good thing - so I think we should WONTFIX this...

FWIW I don't see a (clear) Kraken regression on the Windows machines on AWFY.
Flags: needinfo?(jdemooij)
yeah, this looks to be linux only, lets wontfix.
Closed: 2 years ago
Resolution: --- → WONTFIX
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