Red Hat Bugzilla – Bug 830400
Firefox CPU load issue on visiting some sites
Last modified: 2013-08-01 07:08:42 EDT
Created attachment 590560 [details]
strace during 10 seconds of firefox process, while doing nothing in UI
Description of problem: CPU load on visiting some sites (e.g. doing a test on www.duolingo.com) jumps to 80%-90%. When stracing the function call gettimeofday is extremely often returned, even when I do nothing in the UI!
Version-Release number of selected component (if applicable): Fedora 17, Firefox 13.0-1.
How reproducible: always
Steps to Reproduce:
1. do a test on www.duolingo.com
2. wait (do nothing in UI)
3. CPU stays high and when stracing firefox process the gettimeofday function called extremely often even when doing nothing in the UI.
Actual results: CPU usage jumps to 80-90% while doing a test and stays there.
Expected results: after stopping work in firefox UI CPU usage for firefox should drop back to normal.
Additional info: attachment of strace
I see the high CPU only when the video is played. Without the video, CPU is low. Can you check it?
Since I'm watching few movies through firefox I had a look at my other surfing behaviour. What seems to be generally happening is that, when performing a CPU intensive activity in the UI in firefox, is that the page is loaded, but the CPU continues to be busy for a long time after loading the page. When I do absolutely nothing in the GUI for the next couple of minutes the CPU load of the firefox process very slowly starts to drop off.
Can you please try to reproduce with binaries from mozilla.org?
Since last saturday the problem is gone. Alas, I can't pinpoint exactly which package update did it since I returned last saturday from holiday and applied then all package updates which came available since August 12th. However CPU load when using firefox has not come above the 10% threshold. So, at least for me, this bug can be closed.
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