I'm running Squid 3.1.15 on a server with 24GB of RAM. The OS is SUSE Linix 11 SP1 64bit. If I change the cache_mem higher then 512, I get the below results. If I leave it at 512, everything is normal. I tried 1024 MB and up to 4096 MB with the same results below. Any ideas? Memory usage for squid via mallinfo(): Total space in arena: -1857900 KB Ordinary blocks: -1872592 KB 11357 blks Small blocks: 0 KB 0 blks Holding blocks: 5580 KB 6 blks Free Small blocks: 0 KB Free Ordinary blocks: 14692 KB Total in use: -1867013 KB 101% Total free: 14693 KB -1% Total size: -1852320 KB Memory accounted for: Total accounted: 2092941 KB -113% memPool accounted: 2092941 KB -113% memPool unaccounted: -3945261 KB 0% memPoolAlloc calls: 178265008 memPoolFree calls: 178851419 Thanks, Mike