1383103 - 2.98% tsvgr_opacity (linux64) regression on push 26a9c5a88cc3f204fcc94e71bb4a1fca02e3207a (Thu Jul 20 2017)

Status: RESOLVED WONTFIX

(Firefox :: Theme, defect)

Description

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

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=26a9c5a88cc3f204fcc94e71bb4a1fca02e3207a

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

Regressions:

  3%  tsvgr_opacity summary linux64 pgo e10s     326.07 -> 335.78


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=8145

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)]

as a note, this is pgo only, we do not see this on opt.

::dao, would you have any ideas why this test might regress after your push?

Comment 2

[Dão Gottwald [:dao]]

The change itself seems innocent, i.e. changing the border radius from 2px to 4px shouldn't be /significantly/ more expensive. But any change in the primary UI will naturally affect the PGO profile causing different areas of code to get optimized. We can't control this directly.

Comment 3

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

ok lets marks this as wontfix!