Hello all Also a question about swap. I have 4G of RAM and partition about 4G for swap. # cat /etc/fstab .... LABEL=SWAP-cciss/c0d0p swap swap defaults 0 0 .... But seems Fedora doesn't use swap # free total used free shared buffers cached Mem: 4086512 3951232 135280 0 160540 898700 -/+ buffers/cache: 2891992 1194520 Swap: 0 0 0 Why?? I've heard that with big amount of physical memory Fedora doesn't use it. I tryed to do # swapon -a no results ... Also i'm very interested who "eats" this memory # ps axuwww | grep -v "USER" | awk '{ vsz = vsz + $5; rss = rss + $6}; END {print "VSZ = ", vsz, " RSS = ", rss}' VSZ = 3229396 RSS = 2659344 so resident set size, the non-swapped physical memory that a tasks has used (in kiloBytes) is 2659344k ~= 2.6G , and virtual memory size of the processes in KiB is about 3.2G . But all this this is much lesser then shows free utility (3.9). can someone explain plz?