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FreeBSD host notes:
- needs to run as root in order to use /dev/tap* networking (why?)
- slirp (usermode networking) is fixed now in cvs, on FreeSBIE 1.0 guests
you still have to manually do:
	echo nameserver 10.0.2.3 >/etc/resolv.conf
but i've been told that that's normal. (fixed on FreeSBIE 1.1.)
and you have to wait a bit for dhclient to do its thing; traffic to
address 10.0.2.2 is routed to 127.1 on the host.
- expect timer problems when guest kernel HZ is > hosts,
for example time sleep 1 takes 49 seconds and booting sleeps for
minutes at the acd0 probe with a FreeSBIE 1.0 guest, thats because
its kernel is built with HZ=5000, and FreeBSD's default is 100...
(no longer a problem with FreeSBIE 1.1.)  The linux 2.6 kernel uses
1000 by default btw.  Enabling /dev/rtc doesn't seem to help either
(not included since it needs a patch to emulators/rtc.)
- using physical media doesn't work on 4.x hosts (missing DIOCGMEDIASIZE
ioctl.)
- the -smb option (smb-export local dir to guest) needs the net/samba
port/package installed in addition to qemu.
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