Talos has detected a Firefox performance regression from push: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=82da16c50e25f9f7e63d235e2827cf9671a8e7f4&tochange=83724fe36744d82ffcfe7e501183bc1101b00630 As author of one of the patches included in that push, we need your help to address this regression. Regressions: 70% ts_paint windows10-64-qr opt e10s stylo 340.58 -> 580.58 70% ts_paint_webext windows10-64-qr opt e10s stylo345.17 -> 588.25 70% ts_paint_heavy windows10-64-qr opt e10s stylo342.83 -> 583.50 62% tpaint windows10-64-qr opt e10s stylo 229.45 -> 371.76 23% ts_paint linux64-qr opt e10s stylo 223.33 -> 275.42 23% ts_paint_webext linux64-qr opt e10s stylo 225.75 -> 278.00 23% ts_paint_heavy linux64-qr opt e10s stylo 223.83 -> 274.75 12% sessionrestore linux64-qr opt e10s stylo 343.75 -> 385.83 4% tresize windows10-64-qr opt e10s stylo 8.64 -> 9.02 Improvements: 23% tresize linux64-qr opt e10s stylo 17.48 -> 13.41 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=14405 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

And here are the Gecko profiles on Windows 10 Quantum Render: for tpaint: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FTkSzOtG-QKq1kqEgBPLyJg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tpaint.zip after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FW28EawitROihl3rkuXSw6A%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tpaint.zip for tabpaint: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FTkSzOtG-QKq1kqEgBPLyJg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tabpaint.zip after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FW28EawitROihl3rkuXSw6A%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tabpaint.zip for ts_paint: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FTkSzOtG-QKq1kqEgBPLyJg%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%2FW28EawitROihl3rkuXSw6A%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_ts_paint.zip for sessionrestore: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FTkSzOtG-QKq1kqEgBPLyJg%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sessionrestore.zip after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FW28EawitROihl3rkuXSw6A%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sessionrestore.zip

Also, here are the Gecko profiles from Linux 64 Quantum Render: for tpaint: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPsSGXPIKRJeyCvHMwpkOog%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tpaint.zip after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FLAC7AW0JTKOtruzq0BT7Mw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tpaint.zip for tabpaint: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPsSGXPIKRJeyCvHMwpkOog%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tabpaint.zip after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FLAC7AW0JTKOtruzq0BT7Mw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_tabpaint.zip for ts_paint: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPsSGXPIKRJeyCvHMwpkOog%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%2FLAC7AW0JTKOtruzq0BT7Mw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_ts_paint.zip for sessionrestore: before: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FPsSGXPIKRJeyCvHMwpkOog%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sessionrestore.zip after: https://perf-html.io/from-url/https%3A%2F%2Fqueue.taskcluster.net%2Fv1%2Ftask%2FLAC7AW0JTKOtruzq0BT7Mw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_sessionrestore.zip

Yup, this regression was expected, but the change was needed for correctness. We'll find ways to speed up these tests. I suspect bug 1476876 will help a lot.

Bug 1476876 fixed the regressions from Windows QR and even brought some perf wins there. == Change summary for alert #14473 (as of Fri, 20 Jul 2018 13:36:33 GMT) == Improvements: 41% ts_paint_webext windows10-64-qr opt e10s stylo 582.25 -> 342.00 41% ts_paint_heavy windows10-64-qr opt e10s stylo 577.92 -> 340.17 41% ts_paint windows10-64-qr opt e10s stylo 572.83 -> 340.83 40% sessionrestore windows10-64-qr opt e10s stylo 491.25 -> 292.33 39% tpaint windows10-64-qr opt e10s stylo 362.94 -> 222.80 21% sessionrestore_many_windows windows10-64-qr opt e10s stylo2,918.17 -> 2,319.42 For up to date results, see: https://treeherder.mozilla.org/perf.html#/alerts?id=14473

However, the regressions from Linux 64 QR remained. Also, there's one last regressions on Windows 10 QR, namely 4% tresize windows10-64-qr opt e10s stylo: it seems that bug 1476876 fixed it for a very short while, but then the improvement disappeared; probably a separate bug canceled it, but I have to check this to properly confirm.

It looks like tresize did in fact get better from bug 1476876, and then was regressed by the changes in https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?changeset=80efe717b563. We can file a separate bug to investigate that, and leave this bug open for the remaining Linux regressions from comment 0.

Any updates regarding the Linux regressions?

Not at this point. The Linux regressions are lower priority since we're focusing on Windows for the first release.

(In reply to Kartikaya Gupta (email:kats@mozilla.com) (parental leave) from comment #6) > It looks like tresize did in fact get better from bug 1476876, and then was > regressed by the changes in > https://hg.mozilla.org/integration/mozilla-inbound/ > pushloghtml?changeset=80efe717b563. We can file a separate bug to > investigate that, and leave this bug open for the remaining Linux > regressions from comment 0. :nical, :jrmuizel was the regression :kats mentioned fixed? I'm asking this because I noticed bug 1477638 brought some big perf improvements and I'm not sure whether they did it on themselves or fixed that regression.

The regression mentioned is covered by bug 1477638