More 'resource' problems with "ath0"

[Ross Finlayson]

The problems are occurring even with a very recently built kernel:

%cat /etc/motd
FreeBSD 6.1-STABLE (GENERIC) #0: Tue May 16 15:55:19 PDT 2006

May 17 07:53:22 ns dhcpd: send_packet: No buffer space available
May 17 07:53:25 ns dhcpd: send_packet: No buffer space available
May 17 07:53:35 ns named[382]: client 66.80.62.46#1026: error sending 
response: not enough free resources

Note that client 66.80.62.46 is on "ath0".

%netstat -m
188/337/525 mbufs in use (current/cache/total)
109/205/314/10688 mbuf clusters in use (current/cache/total/max)
109/147 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)
265K/494K/759K 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)
0/87/2928 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
1904 requests for I/O initiated by sendfile
246 calls to protocol drain routines

Any ideas?  Has anyone else run into this problem?

Is there anything else I can run (other than "netstat -m") to help 
diagnose this  problem?

         Ross.