Here's the mystery. I'm running F12 from a 4GB USB key with a 2.5GB persistent overlay on a machine with 2GB of memory. Top shows Mem: 2060824k total, 1912924k used, 147900k free, 89556k buffers Swap: 4112376k total, 276k used, 4112100k free, 1478628k cached Where is it finding 4GB of swap?