Bug 129530

Summary:	REGRESSION(r164764): 2% regressions on DYEBench and 5% regressions on cssquery-dojo and dom-traverse
Product:	WebKit	Reporter:	Ryosuke Niwa <rniwa>
Component:	JavaScriptCore	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	fpizlo, ggaren, mhahnenberg, webkit-bug-importer
Priority:	P2	Keywords:	InRadar, Regression
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified

Description Ryosuke Niwa 2014-02-28 19:44:18 PST

According to perf.webkit.org, http://trac.webkit.org/changeset/164764 caused 5-10% regressions on various DOM benchmarks:

https://perf.webkit.org/#mode=charts&chartList=%5B%5B%22mac-mavericks%22%2C%22Dromaeo%2Fcssquery-dojo%3ARuns%22%5D%2C%5B%22mac-mountainlion%22%2C%22Dromaeo%2Fcssquery-dojo%3ARuns%22%5D%2C%5B%22mac-mountainlion%22%2C%22Dromaeo%2Fcssquery-dojo%3ARuns%22%5D%2C%5B%22mac-mavericks%22%2C%22Dromaeo%2Fcssquery-dojo%3ARuns%22%5D%2C%5B%22mac-mavericks%22%2C%22DoYouEvenBench%2FFull%3ATime%3ATotal%22%5D%2C%5B%22mac-mountainlion%22%2C%22DoYouEvenBench%2FFull%3ATime%3ATotal%22%5D%5D

Most notably, there is 2% regression on DYEBench.

Comment 1 Radar WebKit Bug Importer 2014-02-28 19:45:15 PST

<rdar://problem/16203575>

Comment 2 Ryosuke Niwa 2014-02-28 20:07:18 PST

Also regressed Dromaeo/dom-traverse by 5%:

https://perf.webkit.org/#mode=charts&chartList=%5B%5B%22mac-mountainlion%22%2C%22Dromaeo%2Fdom-traverse%3ARuns%22%5D%5D&days=39