Hello members, this is the stat info from squidclient's output: Cache information for squid: Request Hit Ratios: 5min: 99.9%, 60min: 99.9% Byte Hit Ratios: 5min: 97.1%, 60min: 98.2% Request Memory Hit Ratios: 5min: 22.2%, 60min: 22.0% Request Disk Hit Ratios: 5min: 25.9%, 60min: 25.9% Storage Swap size: 225816 KB Storage Mem size: 4404 KB Mean Object Size: 63.97 KB Requests given to unlinkd: 0 it said my storage mem size is 4404 KB, though I have set the cache_mem size to 1.8 GB in squid.conf: cache_mem 1800 MB maximum_object_size 2048 KB maximum_object_size_in_memory 128 KB half_closed_clients off memory_pools_limit 150 MB why "request memory hit ratios" is so low (about 22%), while squid has used so few memory (only 4M)? Thanks!