1297024 - 3.03 - 27.42% tabpaint / tart / tps (windows7-32, windows8-64, windowsxp) regression on push b1c893387fdd8785e61602f8098c16f2e50a731e (Sat Aug 20 2016)

Status: RESOLVED FIXED

(Firefox :: Untriaged, defect)

Description

[Alison Shiue]

Talos has detected a Firefox performance regression from push b1c893387fdd8785e61602f8098c16f2e50a731e. As author of one of the patches included in that push, we need your help to address this regression.

Summary of tests that regressed:

  tps summary windowsxp opt e10s: 47.74 -> 56.05 (17.41% worse)
  tabpaint summary windows7-32 pgo e10s: 50.48 -> 64.32 (27.42% worse)
  tart summary windows7-32 pgo e10s: 5.02 -> 5.17 (3.03% worse)
  tps summary windows7-32 pgo e10s: 46.55 -> 57 (22.44% worse)
  tps summary windows8-64 opt e10s: 38.19 -> 41.72 (9.23% worse)
  tps summary windows7-32 opt e10s: 56.07 -> 66.82 (19.18% worse)
  tabpaint summary windows8-64 pgo e10s: 51.97 -> 60.94 (17.26% worse)


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=2591

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

[Alison Shiue]

This issue might be caused by one of following changesets: 
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=fd8d766932630c6e2c34a6e02eb8c428bb898b46&tochange=b1c893387fdd8785e61602f8098c16f2e50a731e

Hi Bill, as you are the patch author, can you take a look at this and determine what is the root cause? Thanks!

Comment 2

[Joel Maher ( :jmaher ) (UTC -8)]

did this get backed out?  it seems like the tps numbers are fixed?

https://treeherder.mozilla.org/perf.html#/alerts?id=2686

Comment 3

[Bill McCloskey [inactive unless it's an emergency] (:billm)]

Yes, it got backed out. Please leave the bug open though.

Comment 4

[Gerry Chang [:gchang]]

Mark 51 as fixed.