1486363 - 16.48% tabpaint (linux64) regression on push 566486a3aa57 (Fri Aug 24 2018)

Status: RESOLVED FIXED

(Firefox :: Screenshots, defect)

Description

[Ionuț Goldan [:igoldan]]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/rev/566486a3aa57

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

Regressions:

 16%  tabpaint linux64 opt e10s stylo     37.75 -> 43.97

Improvements:

 16%  tp5o responsiveness windows7-32 pgo e10s stylo     0.59 -> 0.50
 10%  tp5o responsiveness linux64 opt e10s stylo         0.95 -> 0.86
  9%  tps windows10-64-qr opt e10s stylo                 9.96 -> 9.06
  8%  tps windows10-64 opt e10s stylo                    13.42 -> 12.35
  8%  tps windows10-64 pgo e10s stylo                    11.84 -> 10.92
  7%  tps linux64-qr opt e10s stylo                      9.03 -> 8.39
  7%  tps windows7-32 opt e10s stylo                     11.98 -> 11.18
  6%  tps linux64 opt e10s stylo                         11.06 -> 10.43
  6%  tp5o responsiveness linux64-qr opt e10s stylo      1.35 -> 1.28
  5%  tps linux64 pgo e10s stylo                         10.71 -> 10.14
  4%  tps windows7-32 pgo e10s stylo                     10.62 -> 10.17
  2%  tp5o linux64 pgo e10s stylo                        133.47 -> 130.29
  2%  tp5o linux64-qr opt e10s stylo                     146.24 -> 143.13
  2%  tp5o linux64 opt e10s stylo                        140.11 -> 137.26


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=15302

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

[Jared Hirsch [:jhirsch] (he/him) (Needinfo please)]

This bug was introduced by reverting the patch for bug 1466575. I've re-landed that patch, which should resolve this bug.