All, 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 hotkernel.pl 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.