1648026 - 5.99 - 21.24% raptor-tp6-twitch-firefox-cold / raptor-tp6-twitch-firefox-cold fcp (linux64-shippable-qr) regression on push 7a13c77442451fdb9fd1032f605f1322a218702b (Mon June 22 2020)

Status: RESOLVED FIXED

(Core :: Layout: Text and Fonts, defect, P1)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a raptor performance regression from push ed8d5ec80203d89a34e68220e7d8476a22f9b867. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

30% raptor-tp6-facebook-firefox-cold loadtime macosx1014-64-shippable opt 3,229.92 -> 4,191.75
15% raptor-tp6-outlook-firefox-cold fcp windows7-32-shippable opt 207.75 -> 238.92
14% raptor-tp6-outlook-firefox-cold fcp windows10-64-shippable opt 207.00 -> 235.33
13% raptor-tp6-pinterest-firefox-cold fcp macosx1014-64-shippable opt 961.50 -> 1,082.75
13% raptor-tp6-outlook-firefox-cold windows7-32-shippable opt 259.77 -> 292.51
12% raptor-tp6-outlook-firefox-cold windows10-64-shippable opt 259.40 -> 290.40
11% raptor-tp6-office-firefox-cold fcp windows7-32-shippable opt 373.25 -> 414.08
9% raptor-tp6-wikipedia-firefox-cold linux64-shippable opt 1,460.09 -> 1,593.61
9% raptor-tp6-wikipedia-firefox-cold fcp linux64-shippable opt 1,434.67 -> 1,564.58
9% raptor-tp6-wikipedia-firefox-cold loadtime linux64-shippable opt 1,551.17 -> 1,684.08
8% raptor-tp6-wikipedia-firefox-cold loadtime windows7-32-shippable opt 1,516.83 -> 1,631.58
7% raptor-tp6-facebook-firefox-cold macosx1014-64-shippable opt 1,351.44 -> 1,449.56
7% raptor-tp6-wikipedia-firefox-cold loadtime windows10-64-shippable opt 1,478.58 -> 1,575.42
5% raptor-tp6-reddit-firefox-cold fcp linux64-shippable opt 255.17 -> 268.67
5% raptor-tp6-pinterest-firefox-cold fcp windows10-64-shippable opt 560.75 -> 588.92
4% raptor-tp6-yandex-firefox-cold fcp windows7-32-shippable opt 307.67 -> 321.08
4% raptor-tp6-wikipedia-firefox-cold windows7-32-shippable opt 1,392.83 -> 1,453.46
3% raptor-tp6-outlook-firefox-cold loadtime windows7-32-shippable opt 612.04 -> 630.42
3% raptor-tp6-facebook-firefox-cold loadtime windows7-32-shippable opt 1,863.00 -> 1,918.00
2% raptor-tp6-outlook-firefox-cold loadtime windows10-64-shippable opt 616.83 -> 631.25
2% raptor-tp6-wikipedia-firefox-cold fcp windows7-32-shippable opt 1,354.75 -> 1,385.17

Improvements:

21% raptor-tp6-twitch-firefox-cold fcp linux64-shippable-qr opt 104.75 -> 82.50
9% raptor-tp6-facebook-firefox-cold loadtime linux64-shippable opt 2,693.08 -> 2,458.08
6% raptor-tp6-twitch-firefox-cold linux64-shippable-qr opt 260.47 -> 244.87
3% raptor-tp6-facebook-firefox-cold linux64-shippable opt 966.63 -> 941.94

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.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1533462

Comment 2

[Sean Voisen (:svoisen)]

I believe we were expecting some performance regressions and improvements from enabling the shared font list. Will set to S2/P1 to get this off our triage radar and let Jonathan assess.

Comment 3

[Florin Strugariu [:Bebe]]

Backout:
Bug 1649692 - 9.18% raptor-tp6-facebook-firefox-cold loadtime (linux64-shippable-qr) regression on push b96cdb2a5b42ba979caca9f4ac93525a869d7d6b (Fri June 26 2020)