3.49% tabpaint (linux64) regression on push 9ad182a8983188fa58876f8d349e3446b9dc4fd4 (Tue Mar 21 2017)




2 years ago
2 years ago


(Reporter: igoldan, Assigned: Gijs)


({perf, regression, talos-regression})

53 Branch
Dependency tree / graph

Firefox Tracking Flags

(Not tracked)


Talos has detected a Firefox performance regression from push 9ad182a8983188fa58876f8d349e3446b9dc4fd4. As author of one of the patches included in that push, we need your help to address this regression.


  3%  tabpaint summary linux64 pgo      68.31 -> 70.69

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=5566

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
Component: Untriaged → DOM: Events
Product: Firefox → Core
Target Milestone: --- → mozilla55
I don't really understand how you decided this was the result of that specific push. I see retriggers on the graph


for my push and some inbound stuff, which isn't really enough to pinpoint a random autoland push.

My push was a backout with a small addition specific to about:preferences (which doesn't affect tabpaint), and there was no corresponding change when the original bug landed, so I don't see how this would have caused a regression like this. It looks to me like more tracking is needed to figure out which bug caused the change here.
Flags: needinfo?(jmaher)
Flags: needinfo?(ionut.goldan)
Thank you for your insights! I'm taking a closer look over the alert.
Flags: needinfo?(ionut.goldan)
Closed: 2 years ago
Resolution: --- → INVALID
thanks igoldan for investigating this.
Flags: needinfo?(jmaher)
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