Adicionar o atributo noatime em casos de brtfs ajuda na performance do sistema:
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=uid /home btrfs defaults,noatime 0 0
UUID=uid /media/hd btrfs defaults,noatime 0 0
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0