Рекомендация размещать /tmp и /var/tmp на tmpfs от разработчиков ядра

http://www.mjmwired.net/kernel/Documentation/filesystems/tmpfs.txt

Some people (including me) find it very convenient to mount it e.g. on /tmp and /var/tmp and have a big swap partition. And now loop mounts of tmpfs files do work, so mkinitrd shipped by most distributions should succeed with a tmpfs /tmp.