Swap writes per second (SWW/s) is the rate at which you are swapping data out of memory and writing it to disks. This is a bad thing. This usually occurs when you overcommit memory, exceed shared pages, overwhelm the balloon driver (which prompt guest OSes to release memory back to the system), and exceed memory compression tolerance. If SWW/s > 0, you will almost surely see performance issues manifest themselves.
↧