Squid opens too much icap connections

I have implemnted a icap server, and configured squid to forward request to
this server.
Everything works fine but, Squid opens too much icap connections and exhaust
my filedescriptors.
I upgraded my squid to latest version Squid Cache: Version 3.1.0.17
Bu it still opens too much icap connections, Sometimes i see in log files ,
such a warning

2010/02/28 00:32:31| client_side.cc(2959) okToAccept: WARNING! Your cache is
running out of filedescriptors

I configured squid to use persistent_connections on but it did not help.

Can you please help.

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