Analysing Traffic going through Proxy Server

Hi All,

Does anyone know a good tool that can analyze traffic going through a linux based proxy server (squid). The tool should be able to plot the traffic going through proxy server dynamically.
IPTraff is not the one recommended as it requires a lot amount of time for analysis.

Once again I do not need a log analyzer but a dynamically plotting tool that can analyze proxy traffic. It can be SNMP based also.

Thanks in Advance,
Srini.