Talos has detected a Firefox performance regression from push 7e35e5f2b9dfb5539598e67e3b08502e111be353. As author of one of the patches included in that push, we need your help to address this regression. Regressions: 21% tresize windows8-64 pgo 10.22 -> 12.36 16% tresize windows7-32 pgo 9.13 -> 10.59 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=5442 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
It's highly unlikely that this patch was the cause of the regression, sorry. The patch replaces an unneeded function in a test file with a utility function. I don't see how this would cause a performance hit in the application. That's all from my side, I'm not sure how to help you with this. Please redirect to the correct cause.
Looking at the graphs, this test went bimodal after bug 1346644 landed, that is almost certainly the root cause here. Let's dupe this to the already-filed bug 1347545 tracking that.
Status: NEW → RESOLVED
Closed: 2 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1347545
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