1479796 - 7.24% tresize (windows10-64-qr) regression on push 2799f012459c (Sat Jul 28 2018)

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect)

Description

[Ionuț Goldan [:igoldan]]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=ce5febb8f86305c322b0e172f6a26037a16e1ee1&tochange=2799f012459c05f34f42ae4007f3515adb902e1e

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

Regressions:

  7%  tresize windows10-64-qr opt e10s stylo     8.24 -> 8.84


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=14644

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

[Ionuț Goldan [:igoldan]]

These are the Gecko profiles tresize, on Windows 10 QR:

before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FZF7De4FXSqSDEjjh9Gc62Q%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tresize.zip

after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FDuNN0M3yRLOyN9saKoWLbw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tresize.zip

Comment 2

[Kartikaya Gupta (email:[e-mail])]

Yeah, this is expected. We need the patch for correctness. Not much we can do about this regression specifically, although bug 1416651 is tracking the overall regression from webrender on this test.