Closed Bug 1156393 Opened 9 years ago Closed 9 years ago

2.7% WinXP tp5o_scroll regression on Mozilla-Inbound-Non-PGO (v. 40) on April 20, 2015 from push 84304d9d0082


(Testing :: Talos, defect)

Windows XP
Not set


(firefox40 fixed)

Tracking Status
firefox40 --- fixed


(Reporter: vaibhav1994, Assigned: mstange)




(1 file)

Talos has detected a Firefox performance regression from your commit 84304d9d0082.  We need you to address this regression.

This is a list of all known regressions and improvements related to your bug:

On the page above you can see Talos 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, please see:

Reproducing and debugging the regression:
If you would like to re-run this Talos test on a potential fix, use try with the following syntax:
try: -b o -p win32 -u none -t g1  # add "mozharness: --spsProfile" to generate profile data

To run the test locally and do a more in-depth investigation, first set up a local Talos environment:

Then run the following command from the directory where you set up Talos:
talos --develop -e <path>/firefox -a tp5o_scroll

Making a decision:
As the patch author we need your feedback to help us handle this regression.
*** Please let us know your plans by Thursday, or the offending patch will be backed out! ***

Our wiki page oulines the common responses and expectations: has two commits. Dmitry, Markus Stange could you look and see if your patch is causing the regression?
Flags: needinfo?(mstange)
Flags: needinfo?(dimas_000)
Bug 1154676 is not at fault.
Assignee: nobody → mstange
Blocks: 1156129
No longer depends on: 1154676, 1156129
Flags: needinfo?(mstange)
Flags: needinfo?(dimas_000)
Retriggered a bunch of times, and the graph makes it very clear that the changeset indeed caused a regression:
The subtest breakdown shows that it's not one specific subtest that regressed, but all of the pages regressed rather uniformly:
Attached patch patchSplinter Review
Caching the bounds seems to fix it.
Attachment #8595675 - Flags: review?(roc)
Closed: 9 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla40
I am sorry guys I am a bit late because of other works and activities...
It looks like the question has been resolved.
Anyway fix for [Bug 1154676]( cannot be the reason of performance regression. The fix is just check on null pointer before call of method and no more. And it affects MAC OS(Cocoa) branch only.
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