[squid-users] Squid eating too much memory

[rihad]

CacheMgr output:
Memory accounted for:
        Total accounted:       1323944 KB

Memory usage using top(1):
  PID USERNAME     THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
29601 squid         29  20    0  2533M  2465M kserel  92:12  0.00% squid


Almost twice as much memory! Any hints?

Number of clients accessing cache:      517
Normally load is within 500-1500 clients.

Squid 2.6.16
FreeBSD 6.2-RELEASE-p8

Port compiled with all options unchecked and both AUFS & KQUEUE checked
(as per "make config" and  /var/db/ports/squid/options)