[Webkit-unassigned] [Bug 24913] qtwebkit 4.5 uses cpu excessively when flash plugin is enabled and web-page containing flash banner is loaded

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=24913


David T. L. Wong <davidtlwong at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |davidtlwong at gmail.com




--- Comment #1 from David T. L. Wong <davidtlwong at gmail.com>  2010-01-20 02:28:58 PST ---
I experience this problem too. 
Using Qt 4.6 and MSVC2008 on Windows XP.
Webkit source is svn trunk r53272.

It seems there are too many timer event.

I modified SharedTimerQt::start() in WebCore/platform/qt/SharedTimerQt.cpp to:

void SharedTimerQt::start(double fireTime)
{
    static int zero_interval_count = 0;
    double interval = fireTime - currentTime();
    unsigned int intervalInMS;
    if (interval < 0) {
        intervalInMS = 0;
    } else {
        interval *= 1000;
        intervalInMS = (unsigned int)interval;
    }

    if (intervalInMS == 0) {
        zero_interval_count++;
        if ((zero_interval_count % 10000) == 0) {
            printf("zero_interval_count = %d, time = %f\n",
zero_interval_count, currentTime());
        }
    }
    m_timer.start(intervalInMS, this);
}

on simple flash that only display a digital clock,
It records 10,000 m_timer.start() calls, with interval equals zero, in 0.536
second

on http://www.adobe.com/flashplatform/ ,
It records 10,000 m_timer.start() calls, with interval equals zero, in 3.165
second

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