13.3" MacBook Air with Core i7 and Mavericks I'm experiencing an issue with my MacBook Air. This happens when I wake it up from sleep. I don't get an more audio and most of the time one of the cores goes up to 100% (AFAIK the Core i7 in MacBook Air has 2 cores and not 4 even though Menumeters shows 4 cores). Activity monitor shows that one process in particular is affecting the processor. This is kernel_task. What is it and what does it do? Why is it going to 100% on wakeup? To get things back to normal I have to restart. Any feedback is appreciated.