[Webkit-unassigned] [Bug 24074] WebKit used 80% CPU on idle

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=24074





------- Comment #15 from dimich at chromium.org  2009-02-22 12:52 PDT -------
I think the busy loop you have experienced was related to a Java applet on 
jira.skype.net

Here is my theory (if I read the tea leaves of samples right): WebKit is trying
to deliver some data via NetscapePluginStream to a plugin - but plugin does not
take any bytes (not ready) and WebKit schedules an async timer event with
timeout 0 to try again. This just repeats a lot, causing sort of a "busy wait"
via a timer with 0 delay. I guess sometimes a plugin needs the main thread's
run loop to run in order to process things and be able to receive more data -
but in this case roundtrip via run loop does not help. See
WebBaseNetscapePluginStream.mm, method deliverData. 

In this case, the plugin seems to be a Java VM. It also seems like
jira.skype.net was using java plugin before the busy loop. 

I can not access this page to try to confirm this theory though.


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