kernel_task 100% CPU

Discussion in 'OS X Mavericks (10.9)' started by dean1012, Nov 12, 2013.

  1. dean1012 macrumors regular

    Jul 10, 2008

    I've noticed after upgrading to Mavericks from Mountain Lion on my 2013 MBA, kernel_task will start using ~100% CPU and stay there.

    I've tried to determine what precisely would cause this... I notice it mostly when I plug my headphones in but I've seen it happen at other times as well.

    Does anyone know of a fix for this besides rebooting? Sometimes putting the computer to sleep will fix it but not all the time and I can't just reboot every time it happens.

    I've ran the script referenced here on the forums and it's output seems to say that 74.6% of the CPU time is "machine_idle", 18.8% is "ml_set_interrupts_enabled", and 5.7% is "AppleHDAController::interruptOccurred()" followed by a ton of neglible entries.
  2. xylitol macrumors 6502

    Nov 2, 2013
  3. dean1012 thread starter macrumors regular

    Jul 10, 2008
    Just an update... I did read that thread (among others) and I don't believe it is audio related at this time.

    However, I do believe I have narrowed it down to either Dropbox or Crashplan+. I'm leaning towards Dropbox.

    First, it only happens when I'm at work. The difference being that at work I have no network connection.

    It doesn't happen all the time but at some point I believe either Crashplan+ or Dropbox's syncing processes cause kernel_task to use >= 100% CPU.

    The reason I believe it is one of these two processes is that if I pause syncing on both Crashplan+ and Dropbox, kernel_task will eventually (within ~1 minute) drop back to normal usage with no other changes to the system.

    I haven't tried disabling syncing on both of these individually but I'll try that next.

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