[Webkit-unassigned] [Bug 175712] New: REGRESSION(r220477 or r220479): ~8% regression on Speedometer 2 Inferno test

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175712

            Bug ID: 175712
           Summary: REGRESSION(r220477 or r220479): ~8% regression on
                    Speedometer 2 Inferno test
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org

We have a regression on Speedometer 2 (beta)'s Inferno test case:
https://perf.webkit.org/v3/#/charts?since=1500698643580&zoom=(1502150451716.6733-1502403902967.6519)&paneList=((18-977-(1502293749323.2402-1502346683886.86)-null-(5-2.5-500))-(18-896-28434716)-(18-946-28436480))&repository=1

I've made a reduced test case that just runs this test case and the results are follows:

r220473:
66.3 ± 0.72
65.1 ± 0.66

r220476
64.6 ± 0.89
66.58 ± 0.64
65.6 ± 0.78

r220479
62.63 ± 0.51
62.4 ± 0.72
62.2 ± 0.77

r220494:
62.8 ± 1.1
62.69 ± 0.57
62.6 ± 0.89

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