Closed Bug 1223191 Opened 9 years ago Closed 9 years ago

[e10s] 20% tab-switch time regression since Firefox 42

Categories

(Core :: DOM: Content Processes, defect)

Product:
Core
Component:
DOM: Content Processes
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED INVALID
Tracking Flags:
Tracking Status
e10s ? ---

People

(Reporter: vladan, Unassigned)

References

(Blocks 1 open bug,
URL
)

Details

Telemetry reports that the duration of the e10s tab-switch spinner (FX_TAB_SWITCH_SPINNER_VISIBLE_MS) regressed significantly in Nightly 42 starting with the July 9th build.

http://mzl.la/1GTIIO0

OS X and Windows are affected, Linux is not. 5th, 50th, 95th percentiles are affected. Aurora 42 shows the same trend.

Changelog for the July 9th build:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=9b902b7669ae&tochange=f34a7120f46b
Oddly enough, Cerberus did not detect this regression
Flags: needinfo?(rvitillo)
Summary: [e10s] Tab-switch time regression in Firefox 42 → [e10s] 20% tab-switch time regression since Firefox 42
Looks like the last bin changed significantly; the algorithm used to detect changes might not work well with changes in the last bucket.
Flags: needinfo?(rvitillo)
This is because of https://bugzilla.mozilla.org/show_bug.cgi?id=1106527. I increased the timeout before the spinner shows from 300ms to 400ms, so we show the spinner less frequently, but when we do it's always after a longer time.
Status: NEW → RESOLVED
Closed: 9 years ago
Resolution: --- → INVALID
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