[Webkit-unassigned] [Bug 40779] New: [Chromium] Perf regression following landing of HTML5 parser

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40779

           Summary: [Chromium] Perf regression following landing of HTML5
                    parser
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andreip at google.com
                CC: eric at webkit.org, abarth at webkit.org,
                    dglazkov at chromium.org, bulach at chromium.org


A new HTML 5 parser landed in WebKit in r61234:

http://trac.webkit.org/changeset/61234

This new parser was turned on in Chromium in

http://src.chromium.org/viewvc/chrome?view=rev&revision=49936

Ever since that change, the Vista and OSX 10.6 perf bots started failing. The Vista bot consistently fails, while the OSX 10.6 one is flaky:

http://build.chromium.org/buildbot/waterfall/builders/Mac10.6%20Perf(1)/builds/4306
http://build.chromium.org/buildbot/waterfall/builders/Vista%20Perf%20(1)/builds/5397

See also the first regression in the following graph:

http://build.chromium.org/buildbot/perf/vista-release-dual-core/intl1/report.html?history=150&rev=-1

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