Tuning FreeNAS & ZFS

I am running FreeNAS 0.7 (rev. 3514) since several weeks as my 'production' server at home on a Mini-ITX Atom based system (see FreeNAS 0.7 on a Intel D945GCLF).

I've done some tuning of FreeBSD and ZFS with good experiences (good performance, no panics, etc.).

Here is what I've done...