21.25 - 8.21% damp custom.netmonitor.exportHar / damp custom.netmonitor.requestsFinished.DAMP + 1 more (Linux, Windows) regression on Mon September 8 2025
Categories
(DevTools :: Netmonitor, defect)
Tracking
(firefox-esr140 unaffected, firefox143 unaffected, firefox144 affected, firefox145 affected)
| Tracking | Status | |
|---|---|---|
| firefox-esr140 | --- | unaffected |
| firefox143 | --- | unaffected |
| firefox144 | --- | affected |
| firefox145 | --- | affected |
People
(Reporter: intermittent-bug-filer, Unassigned)
References
(Regression)
Details
(4 keywords)
Perfherder has detected a devtools performance regression from push 0d112c50725d357a14bdc151fa536aa5217a28b9. As author of one of the patches included in that push, we need your help to address this regression.
Please acknowledge, and begin investigating this alert within 3 business days, or the patch(es) may be backed out in accordance with our regression policy. Our guide to handling regression bugs has information about how you can proceed with this investigation.
If you have any questions or need any help with the investigation, please reach out to bacasandrei@mozilla.com. Alternatively, you can find help on Slack by joining #perf-help, and on Matrix you can find help by joining #perftest.
Regressions:
| Ratio | Test | Platform | Options | Absolute values (old vs new) |
|---|---|---|---|---|
| 21% | damp custom.netmonitor.exportHar | windows11-64-24h2-shippable | e10s fission stylo webrender | 257.88 -> 312.67 |
| 12% | damp custom.netmonitor.requestsFinished.DAMP | windows11-64-24h2-shippable | e10s fission stylo webrender | 957.21 -> 1,075.72 |
| 8% | damp custom.netmonitor.requestsFinished.DAMP | linux1804-64-shippable-qr | e10s fission stylo webrender | 2,361.93 -> 2,555.82 |
Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests.
If you need the profiling jobs you can trigger them yourself from treeherder job view or ask bacasandrei@mozilla.com to do that for you.
You can run all of these tests on try with ./mach try perf --alert 46733
The following documentation link provides more information about this command.
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Updated•1 month ago
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Comment 1•1 month ago
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Set release status flags based on info from the regressing bug 1830230
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Comment 2•1 month ago
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Thanks for reporting.
These regressions are expected as we are now sending a new content complete event for each request.
Cheers
Description
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