Joel Maher ( :jmaher ) (UTC -8) Reporter
	Description • 8 years ago

Talos has detected a Firefox performance regression from push fea76c9b016b3175f93aacd68e4f095906bb9c7c. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

  2%  cart summary linux64 opt          30.93 -> 31.62
  2%  cart summary linux64 opt e10s     32.9 -> 33.6


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=3177

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

	Joel Maher ( :jmaher ) (UTC -8) Reporter
	Comment 1 • 8 years ago

here is a compare view of the non-e10s:
https://treeherder.mozilla.org/perf.html#/comparesubtest?originalProject=mozilla-inbound&originalRevision=66b76839f96ac8651d5a43bd410c08625770184d&newProject=mozilla-inbound&newRevision=fea76c9b016b3175f93aacd68e4f095906bb9c7c&originalSignature=5470dd119f529e9cc4ca90863bb3950b11ae265f&newSignature=5470dd119f529e9cc4ca90863bb3950b11ae265f&framework=1

the 3 regressed:
cart 3-customize-enter-css.half.TART opt
cart 3-customize-enter-css.all.TART opt
cart 2-customize-exit.error.TART opt

:dao, can you look into this and determine if this is something we should fix or accept?

	Dão Gottwald [:dao]
	Comment 2 • 8 years ago

The patch that landed was fairly simple. I bet the regression comes from the buttons at the bottom now being rendered natively. Either that or it must be CSS variable overhead (but then it shouldn't be Linux-only). Either way I think we need to accept the regression.