0.11% installer size (OSX) regression on Thu August 14 2025
Categories
(Testing :: Performance, defect)
Tracking
(Not tracked)
People
(Reporter: intermittent-bug-filer, Unassigned)
Details
(Keywords: perf-alert, regression)
Perfherder has detected a build_metrics performance regression from push 9f68f9ffc4e8e41cc7ee3d3ad4f928138f0ff125. 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 afinder@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) |
|---|---|---|---|---|
| 0.11% | installer size | osx-aarch64-shippable | aarch64 nightly | 104,235,385.88 -> 104,346,347.92 |
Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests.
You can run all of these tests on try with ./mach try perf --alert 46492
The following documentation link provides more information about this command.
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Updated•4 months ago
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Comment 1•4 months ago
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Hi Donal! Looks like we have another regression caused by mozilla-central repo-update HSTS HPKP remote-settings. Can you look into this when possible and let us know your thoughts ? It doesn't look like a high magnitude regression.
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Comment 2•4 months ago
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I have no strong opinions. The remote settings updates are automatically generated, and Release Management take care of landing them.
The push mentioned here is already in Fx143.
I'll leave it up to the perf team if this needs a follow-up or should be resolved as wontfix?
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Comment 3•4 months ago
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Thanks Donal! Also, removing the needinfo for Florin for the moment.
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Updated•4 months ago
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Updated•4 months ago
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Updated•4 months ago
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Comment 5•4 months ago
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This bug was incorrectly closed as "Duplicate" since the bug referenced is on a different culprit than the one referenced in comment 0. Since the regression is of low magnitude, the correct resolution for this is WONTFIX.
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Comment 6•4 months ago
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Why do you think that the culprit is different? I think that the duplicate was correctly identified.
If you look at the regression range, it contains the commit that updates the softblocks-addons-mlbf.bin file, conveniently described by softblocks-addons-mlbf.bin.meta.json. The latter shows that the size increased from 9351 bytes to 162620 bytes, which is the primary cause of the flagged binary size changes in this bug and bug 1984640 (with more discussion on the latter bug, hence my inclination to close this as a duplicate of the other).
Description
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