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

RESOLVED FIXED in Firefox 57



2 years ago
2 years ago


(Reporter: igoldan, Assigned: emilio)


({perf, regression, talos-regression})

56 Branch
Dependency tree / graph

Firefox Tracking Flags

(firefox-esr52 unaffected, firefox55 unaffected, firefox56 disabled, firefox57 fixed)


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: https://treeherder.mozilla.org/perf.html#/alerts?id=8485

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
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
: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: 2 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla57
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