Open Bug 1744038 Opened 3 years ago Updated 2 years ago

47.04 - 22.25% a11yr dhtml.html / a11yr dhtml.html (Linux, OSX) regression on Sat November 27 2021

Categories

(Core :: DOM: Navigation, defect)

Product:
Core
Component:
DOM: Navigation
Type:
defect

Tracking

()

Tracking Flags:
Tracking Status
firefox96 --- wontfix
firefox97 --- wontfix

People

(Reporter: bacasandrei, Unassigned)

References

(Regression)

Details

(4 keywords)

Perfherder has detected a talos performance regression from push 56a1fce20849e569b75856301c801f89a0d6e0b9. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio Test Platform Options Absolute values (old vs new)
47% a11yr dhtml.html linux1804-64-shippable-qr e10s fission stylo webrender 380.96 -> 560.16
22% a11yr dhtml.html macosx1015-64-shippable-qr e10s fission stylo webrender 319.62 -> 390.73

Improvements:

Ratio Test Platform Options Absolute values (old vs new)
3% tresize linux1804-64-shippable-qr e10s fission stylo webrender 21.63 -> 21.00

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

Flags: needinfo?(peterv)

I'm not sure which one of these bugs (Bug 1741132, Bug 1740517 or Bug 1740516) caused the above regression. Can you provide more information? Thanks.

(In reply to Acasandrei Beatrice from comment #1)

I'm not sure which one of these bugs (Bug 1741132, Bug 1740517 or Bug 1740516) caused the above regression. Can you provide more information?

Bug 1740516 and bug 1740517 only affect loads from session history (so going backwards in session history). Bug 1741132 makes us keep less pages in the BFCache, which also only affects loads from session history. Unless I'm missing something these tests don't navigate in session history, so it seems highly unlikely that these caused the regression.

Alexander, am I right in thinking that the a11y dhtml.html test doesn't navigate in session history?

Flags: needinfo?(peterv) → needinfo?(surkov.alexander)

Eitan, do you know anything about the a11y talos tests? These were before my time and I don't know anything about them. :(

Flags: needinfo?(surkov.alexander) → needinfo?(eitan)
Has Regression Range: --- → yes
Flags: needinfo?(eitan)
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