[SQU] cache keeps growing

Hi,
  I have a 4G free space on my HD and I thought giving squid 1G would be enough, so I decided to configure the cache dir as:
cache_dir ufs /usr/local/squid/cache 1000 16 256

Yet squid cache dir keeps growing until it takes all of my HD free space then it stops responding to users. Am I missing anything here?
Is there any other way I can limit the cache from growing especially swap.state.

I'm running Redhat 6.1/ squid 2.3.STABLE3

I appreciate your help

A. Mutrib

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