What Energy said. Don't worry if it isn't using swap space. Swap is a last resort effort. You want it to not use swap space. It's slower then RAM. If you want to see your swap in action. Open up about 5 instances of Mozilla then do a top. You'll see your swap screaming in pain. Another thing, as a rule of thumb. Your swap is supposed to be the same size as your RAM. Or double it. One or the other. I can't remember. : )