[Users] regarding memory usage

Hi 1. Is there any benefit of increasing the value of PKG_MEM_POOL_SIZE and SHM_MEM_SIZE ? /*used only if PKG_MALLOC is defined*/ #define PKG_MEM_POOL_SIZE 1024*1024 /*used if SH_MEM is defined*/ #define SHM_MEM_SIZE 32 2. I've compiled my ser with #define PKG_MEM_POOL_SIZE 1024*1024*512 ans started using ser -m 100 option with children=4 and listening on two ips when I started memory usages was seems to fine for few days(3-4) less then 1GB but after that nealy 1.7 - 1.8 GB of memory usage and when I do top: 16165 root 15 0 617m 54m 36m S 0.3 2.7 0:16.34 ser 16167 root 15 0 617m 54m 36m S 0.3 2.7 0:15.89 ser 16164 root 15 0 617m 54m 36m S 0.3 2.7 0:16.29 ser 16166 root 15 0 617m 54m 36m S 0.7 2.7 0:16.16 ser 16172 root 16 0 617m 53m 35m S 0.0 2.7 0:05.04 ser 16168 root 16 0 617m 52m 34m S 0.0 2.6 0:00.09 ser 16170 root 16 0 617m 52m 34m S 0.0 2.6 0:00.07 ser 16169 root 16 0 617m 52m 34m S 0.0 2.6 0:00.08 ser 16171 root 16 0 617m 52m 34m S 0.0 2.6 0:00.10 ser 16163 root 16 0 617m 52m 34m S 0.0 2.6 0:00.01 ser 16145 root 25 0 617m 52m 34m S 0.0 2.6 0:07.80 ser it shows 11 instance of ser with above info. If I sum up 617 * 11 = 6787 MB of memory but in my machine I've only 2 GB Physical RAM and it never uses Swap ? if 54 * 11 = 594 ? but free -m and top shows more memory usage ? can please explain me in brief . I'll be really thankfull. B'coz of this I'm facing may problem. thanks arun