On my machine running slip, an abnormal number of socket option mbufs
are being used.  This number appears to slowly creep upwards.

451 mbufs in use:
        4 mbufs allocated to packet headers
        22 mbufs allocated to protocol control blocks
        9 mbufs allocated to socket names and addresses
        416 mbufs allocated to socket options
1/26 mapped pages in use
108 Kbytes allocated to network (53% in use)

This is on an i386, and doesn't happen to a machine not running slip.
I haven't gone code poking as yet.

-john