>>717
FreeBSD em ether driver lockup
http://lists.freebsd.org/pipermail/freebsd-net/2004-June/004277.html
http://lists.freebsd.org/pipermail/freebsd-net/2004-June/004280.html

> Some vendors are kind enough to sell motherboards broken enough for em
> to never get interrupts. However the current driver does not fire a
> watchdog on those boards either.

ううむ。