1447016 - 3% kraken (windows7-32) regression on push 0a403eafe620 (Fri Mar 16 2018)

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Ionuț Goldan [:igoldan]]

Talos has detected a Firefox performance regression from push:

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=1751b92b6e6a25c54d2cb05164beb23f6cca60c1&tochange=0a403eafe620db5e5750a77a88bb680ba762f6a4

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

Regressions:

  3%  kraken windows7-32 pgo e10s stylo     1,582.52 -> 1,631.37


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=12207

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]]

:jandem It seems bug 1445235 caused this regression which happens on Windows. I believe this is a wontfix. Am I right?

Comment 2

[Jan de Mooij [:jandem]]

(In reply to Ionuț Goldan [:igoldan], Performance Sheriffing from comment #1)
> :jandem It seems bug 1445235 caused this regression which happens on
> Windows. I believe this is a wontfix. Am I right?

Yeah unfortunately :/

Comment 3

[Ionuț Goldan [:igoldan]]

Another round of kraken regressions on Windows, since https://bugzilla.mozilla.org/show_bug.cgi?id=1445235#c14

== Change summary for alert #12406 (as of Wed, 28 Mar 2018 11:27:50 GMT) ==

Regressions:

  3%  kraken windows10-64 pgo e10s stylo     1,502.68 -> 1,547.93
  2%  kraken windows10-64 opt e10s stylo     1,544.26 -> 1,577.52
  1%  kraken windows7-32 opt e10s stylo      1,660.42 -> 1,673.17
  1%  kraken windows7-32 pgo e10s stylo      1,651.52 -> 1,660.96

For up to date results, see: https://treeherder.mozilla.org/perf.html#/alerts?id=12406

Comment 4

[Jan de Mooij [:jandem]]

All bounds checks should be mitigated by now so hopefully the remaining Spectre work won't regress Kraken much more.