Well, lookie at this:

	11381 mbufs in use:
		2 mbufs allocated to data
		5 mbufs allocated to packet headers
		10 mbufs allocated to protocol control blocks
		2 mbufs allocated to socket names and addresses
		11362 mbufs allocated to socket options
	1/70 mapped pages in use
	1562 Kbytes allocated to network (91% in use)
	0 requests for memory denied
	0 requests for memory delayed
	0 calls to protocol drain routines

This is an netstat -m output. Note the horrendous number of mbufs
allocated to socket options. There is clearly a leak here, as
this number increases as my system stays up.  This is with a
1.0+patches kernel, but it may apply to -current as well (and if
there's an easy patch to the release I'd like to hear about it).