cache_replacement_policy
This directive controls the replacement policy for Squid’s disk cache. Version 2.5
offers three different replacement policies: least recently used
(LRU), greedy dual-size frequency (GDSF), and least frequently used
with dynamic aging (LFUDA). Note that the keywords (lru, GDSF, etc.) are case-sensitive! See Section 7.5 for additional
information.