buffer question

i am using your latest stable benchmark for squid 2.3. everytime i run
the polysrv or squid using the polyclt, polygraph will echo to me 'error

(via Connection.cc) insufficient buffer space' if i try to run more than

10 requests/sec. will you please tell me exactly what the problem is and
how to
fix it. i have tried an older stable version of polygraph, but same
error.

thanks,
dayman - click array, inc.