> a) ps ax | grep lockd returns:
     >    94 ?  DW 0:00 [lockd]
     >     Why would lockd be in state "D"? Looks bad. Can this happen
     >     in normal usage? It kicks the loadavg up 1 point.
<snip>
     >     [ 10-second delay here ]
     >     09:24:18.988289 violinux.async.com.br.793 >
     >     anthem.async.com.br.sometimes-rpc4: udp 180 (DF)
     >     [ 11-second delay here ]
OK, so you are sending out the RPC request to the server's NLM daemon,
which is clearly receiving the packet (since tcpdump was able to log
it), but is never sending a reply. Are you seeing any kernel messages
in the syslog?
BTW: the tcpdumps you're showing are all UDP, not TCP...
Cheers,
  Trond
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