Closed Bug 1386596 Opened 7 years ago Closed 7 years ago

1.51 - 4.76% a11yr / tp5o (windows7-32) regression on push e9ec92fd4f47d69cec602e81bb283d045b6bd87a (Sat Jul 15 2017)


(Core :: CSS Parsing and Computation, defect)

56 Branch
Not set



Tracking Status
firefox-esr52 --- unaffected
firefox55 --- unaffected
firefox56 --- disabled
firefox57 --- fixed


(Reporter: igoldan, Assigned: emilio)



(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.


  5%  a11yr summary windows7-32 opt e10s     737.29 -> 772.42
  2%  tp5o summary windows7-32 opt e10s      338.11 -> 343.22

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:
Blocks: 1380789
Component: Untriaged → CSS Parsing and Computation
Flags: needinfo?(emilio+bugs)
Product: Firefox → Core
No longer blocks: 1380789
Component: CSS Parsing and Computation → Untriaged
Product: Core → Firefox
Component: Untriaged → CSS Parsing and Computation
Product: Firefox → Core
Blocks: 1380789, 1373320
:emilio These regression alerts triggered rather late. I filed this bug for tracking reasons. Treat it like you treat the other related bug 1381844.
Yeah, the right fix for those is coming. If there's still a regression, I can still downgrade the hottest ones to debug only.
Flags: needinfo?(emilio+bugs)
AFAICT, these regressions are still present.
Assignee: nobody → emilio+bugs
Version: unspecified → 56 Branch
Emilio, any luck here? Do you still see the perf regression in 56? Thanks.
Flags: needinfo?(emilio+bugs)
Should be fixed given we moved the assertions back to debug-only in bug 1381844, and it's the same push the one that caused it.
Flags: needinfo?(emilio+bugs)
Closed: 7 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla57
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