mbuf の様子はこんなかんじ。

%netstat -m
775/1010/1785 mbufs in use (current/cache/total)
514/736/1250/33792 mbuf clusters in use (current/cache/total/max)
450/686 mbuf+clusters out of packet secondary zone in use (current/cache)
0/0/0/0 4k (page size) jumbo clusters in use (current/cache/total/max)
0/0/0/0 9k jumbo clusters in use (current/cache/total/max)
0/0/0/0 16k jumbo clusters in use (current/cache/total/max)
1221K/1724K/2946K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
237/316/8704 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
9194 requests for I/O initiated by sendfile
68 calls to protocol drain routines