[초보]메모리가 왜 3메가 밖에 안남나요?^^ (전체256메가)

어떻게 해야 좋을련지^^; 서버가 벅벅 거려요..
서버는 무료계정을 나눠주는데 사용되구요, 5명정도밖에 안줬거든요?

왜이러죠? ㅠㅠ

다른 친구들꺼 해보니까 메모리가 남던데 ㅡㅡ; 내꺼만 4메가 남네요
11:08am up 3 days, 12:09, 3 users, load average: 0.01, 0.05, 0.04
83 processes: 77 sleeping, 1 running, 0 zombie, 5 stopped
CPU states: 0.4% user, 0.5% system, 0.0% nice, 14.0% idle
Mem: 255248K av, 250824K used, 4424K free, 0K shrd, 34716K buff
Swap: 522104K av, 13440K used, 508664K free 126816K cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
10544 root 17 0 900 900 696 R 2.8 0.3 0:00 top
1 root 8 0 452 424 424 S 0.0 0.1 0:07 init
2 root 9 0 0 0 0 SW 0.0 0.0 0:00 keventd
3 root 9 0 0 0 0 SW 0.0 0.0 0:00 kapmd
4 root 19 19 0 0 0 SWN 0.0 0.0 0:00 ksoftirqd_CPU0
5 root 9 0 0 0 0 SW 0.0 0.0 0:00 kswapd
6 root 10 0 0 0 0 SW 0.0 0.0 18:31 kscand
7 root 9 0 0 0 0 SW 0.0 0.0 0:00 bdflush
8 root 9 0 0 0 0 SW 0.0 0.0 0:00 kupdated
9 root -1 -20 0 0 0 SW< 0.0 0.0 0:00 mdrecoveryd
13 root 9 0 0 0 0 SW 0.0 0.0 0:00 kjournald
80 root 9 0 0 0 0 SW 0.0 0.0 0:00 khubd
221 root 9 0 0 0 0 SW 0.0 0.0 0:00 kjournald
465 root 9 0 0 0 0 SW 0.0 0.0 0:00 eth0
515 root 9 0 524 480 480 S 0.0 0.1 0:00 syslogd
519 root 9 0 396 384 384 S 0.0 0.1 0:00 klogd
530 rpc 9 0 520 516 504 S 0.0 0.2 0:00 portmap
567 named 9 0 1720 1428 1428 S 0.0 0.5 0:00 named
568 named 9 0 1720 1428 1428 S 0.0 0.5 0:00 named
569 named 9 0 1720 1428 1428 S 0.0 0.5 0:02 named
571 named 9 0 1720 1428 1428 S 0.0 0.5 0:00 named
572 named 9 0 1720 1428 1428 S 0.0 0.5 0:00 named
584 root 9 0 1024 952 912 S 0.0 0.3 0:26 opensshd
595 root 9 0 588 476 476 S 0.0 0.1 0:00 xinetd
662 root 9 0 1584 1116 1048 S 0.0 0.4 0:00 sendmail
671 smmsp 8 0 1368 980 948 S 0.0 0.3 0:00 sendmail
687 root 8 0 1840 860 832 S 0.0 0.3 0:00 libhttpd.ep
711 nobody 8 0 876 692 648 S 0.0 0.2 0:00 proftpd
770 mysql 9 0 4520 4136 1496 S 0.0 1.6 0:01 mysqld
779 mysql 8 0 4520 4136 1496 S 0.0 1.6 0:01 mysqld
781 mysql 9 0 4520 4136 1496 S 0.0 1.6 0:02 mysqld
815 xfs 9 0 3052 760 640 S 0.0 0.2 0:00 xfs
823 root 9 0 344 300 300 S 0.0 0.1 0:00 mingetty
824 root 9 0 344 300 300 S 0.0 0.1 0:00 mingetty
825 root 9 0 344 300 300 S 0.0 0.1 0:00 mingetty

--------------------

ps -aux도 해봤서요

[root@ns root]# ps -aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.1 1224 424 ? S Jun26 0:07 init
root 2 0.0 0.0 0 0 ? SW Jun26 0:00 [keventd]
root 3 0.0 0.0 0 0 ? SW Jun26 0:00 [kapmd]
root 4 0.0 0.0 0 0 ? SWN Jun26 0:00 [ksoftirqd_CPU0]
root 5 0.0 0.0 0 0 ? SW Jun26 0:00 [kswapd]
root 6 0.3 0.0 0 0 ? SW Jun26 18:32 [kscand]
root 7 0.0 0.0 0 0 ? SW Jun26 0:00 [bdflush]
root 8 0.0 0.0 0 0 ? SW Jun26 0:00 [kupdated]
root 9 0.0 0.0 0 0 ? SW< Jun26 0:00 [mdrecoveryd]
root 13 0.0 0.0 0 0 ? SW Jun26 0:00 [kjournald]
root 80 0.0 0.0 0 0 ? SW Jun26 0:00 [khubd]
root 221 0.0 0.0 0 0 ? SW Jun26 0:00 [kjournald]
root 465 0.0 0.0 0 0 ? SW Jun26 0:00 [eth0]
root 515 0.0 0.1 1296 480 ? S Jun26 0:00 syslogd -m 0
root 519 0.0 0.1 1224 384 ? S Jun26 0:00 klogd -x
rpc 530 0.0 0.2 1372 516 ? S Jun26 0:00 [portmap]
named 567 0.0 0.5 10268 1428 ? S Jun26 0:00 [named]
named 568 0.0 0.5 10268 1428 ? S Jun26 0:00 [named]
named 569 0.0 0.5 10268 1428 ? S Jun26 0:02 [named]
named 571 0.0 0.5 10268 1428 ? S Jun26 0:00 [named]
named 572 0.0 0.5 10268 1428 ? S Jun26 0:00 [named]
root 584 0.0 0.3 2516 952 ? S Jun26 0:26 /usr/sbin/opensshd
root 595 0.0 0.1 1812 476 ? S Jun26 0:00 xinetd -stayalive -reuse -pidfile /var/run/xinetd.pid
root 662 0.0 0.4 5208 1116 ? S Jun26 0:00 [sendmail]
smmsp 671 0.0 0.3 4520 980 ? S Jun26 0:00 [sendmail]
root 687 0.0 0.3 9176 860 ? S Jun26 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_HTTPD -DHAVE_PROXY -DHAVE
nobody 711 0.0 0.2 2124 696 ? S Jun26 0:00