I forgot to write down here some more information: $ free -h total used free shared buffers cached Mem: 5.8G 4.2G 1.6G 2.9G 64M 3.2G -/+ buffers/cache: 928M 4.9G Swap: 511M 0B 511M /etc/fstab /dev/sda3 / ext4 rw,relatime,data=ordered 0 1 /dev/cdrom /media/cdrom iso9660 ro,user,noauto,unhide 0 0 /swapfile none swap defaults 0 0 -- Regards from Pal