1538091 - 2.02 - 2.4% sessionrestore / startup_about_home_paint / ts_paint / ts_paint_webext (linux64-pgo-qr) regression on push cd0c67b9aeddba87b444752885396697da387620

Status: RESOLVED DUPLICATE of bug 1528332

(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=d12bb5576d0f1ce9e24ff42dd567c337431504a3&tochange=cd0c67b9aeddba87b444752885396697da387620

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

Regressions:

2% sessionrestore linux64-pgo-qr opt e10s stylo 982.88 -> 1,006.50
2% ts_paint_webext linux64-pgo-qr opt e10s stylo 845.21 -> 865.17
2% ts_paint linux64-pgo-qr opt e10s stylo 844.25 -> 862.17
2% startup_about_home_paint linux64-pgo-qr opt e10s stylo 1,198.08 -> 1,222.33

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=19997

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/Performance_sheriffing/Talos/Tests

For information on reproducing and debugging the regression, either on try or locally, see: https://wiki.mozilla.org/Performance_sheriffing/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/Performance_sheriffing/Talos/RegressionBugsHandling

Comment 1

[Ionuț Goldan [:igoldan]]

These are the Gecko profiles for sessionrestore:

before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FFmFJoIOeRJOcLcXvwW3HIg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sessionrestore.zip

after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPbo0bJXlRLylkTvzGpU0iQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sessionrestore.zip

For ts_paint:

before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FFmFJoIOeRJOcLcXvwW3HIg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_ts_paint.zip

after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPbo0bJXlRLylkTvzGpU0iQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_ts_paint.zip

For startup_about_home_paint:

before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FFmFJoIOeRJOcLcXvwW3HIg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_startup_about_home_paint.zip

after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPbo0bJXlRLylkTvzGpU0iQ%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_startup_about_home_paint.zip

Comment 2

[Jeff Muizelaar [:jrmuizel]]

This is most likely another manifestation of bug 1528332 just like bug 1530951 and 1527829. Since, we're not shipping on Linux I'm just going to dup it against bug 1528332

Comment 3

[Glenn Watson [:gw]]

Yup, I agree with Jeff's conclusion above.