1465778 - 1.89 - 3.26% damp (osx-10-10, windows10-64, windows7-32) regression on push 6c0ff9599fc9c08faa793bb7ba7641b6bcf964b1 (Wed May 30 2018)

Status: RESOLVED WONTFIX

(DevTools :: Netmonitor, defect, P3)

Description

[Ionuț Goldan [:igoldan]]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=6c0ff9599fc9c08faa793bb7ba7641b6bcf964b1

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

Regressions:

  3%  damp windows7-32 pgo e10s stylo     83.85 -> 86.58
  3%  damp windows10-64 pgo e10s stylo    81.19 -> 83.72
  3%  damp osx-10-10 opt e10s stylo       129.80 -> 133.32
  3%  damp windows7-32 opt e10s stylo     91.61 -> 93.98
  2%  damp windows10-64 opt e10s stylo    86.91 -> 88.54


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=13561

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

[Alexandre Poirot [:ochameau] [PTO back August 21]]

Thanks for the report.

This is mostly this regression:
  complicated.netmonitor.exportHar 	1,661.95 ± 1.73% 	< 	1,743.48 ± 0.97% 	4.91%
that ends up impacting following tests and trigerring this alert.

Unfortunately, bug 1449162 has a negative impact on HAR export. I made my best to lower the regression but this is the best I could do. I'll hopefully come back to that and improve the performance of this in bug 1462561.

Comment 2

[Dave Hunt [:davehunt] [he/him] ⌚BST]

Acceepting this regression as it's been 2 years since it was reported.