>>788
# ps up 3408
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 3408 0.0 0.0 61556 2676 ? S 08:48 0:01 dovecot-auth
# ps up 3410
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 3410 0.0 0.0 61476 2588 ? S 08:48 0:00 dovecot-auth -w

ちなみに・・・
auth_cache_size = 0
auth_cache_ttl = 0
auth_cache_negative_ttl = 0