High memory on virtual server

I'm running an Ubuntu 10.04 virtual server, currently idle and hosting just a handful of sites, the specs of which are:

Disc Space 10GB (Raid10)
CPU Resources 1GHz (4 cores)
Bandwidth 100GB
VPS Environment
OpenVZ + SolusVM
Guaranteed RAM 512MB
Burstable RAM 1024 MB

I'm running a very simple lamp setup with nginx + php-fpm + mysql + postfix + dovecot.

The machine cpu usage is negligible right now but it's using +-500mb of ram with only minimal services running. I'm not an experienced linux user so I'm not too sure how to interpret these readings.

I've attached the following outputs:

top


top - 23:18:15 up 38 min, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 46 total, 1 running, 44 sleeping, 1 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1048576k total, 556612k used, 491964k free,  0k buffers
Swap:  0k total,  0k used,  0k free,  0k cached

 PID USER  PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
32398 mysql  15 0 239m 27m 7052 S 0 2.7 0:03.12 mysqld
25697 bind  21 0 156m 15m 2204 S 0 1.6 0:00.02 named
25736 www-data 15 0 207m 15m 8032 S 0 1.5 0:03.76 php5-fpm
25735 www-data 15 0 206m 15m 8052 S 0 1.5 0:03.81 php5-fpm
25728 www-data 15 0 206m 15m 8324 S 0 1.5 0:03.79 php5-fpm
25732 www-data 15 0 206m 14m 7452 S 0 1.4 0:03.80 php5-fpm
25729 www-data 15 0 206m 14m 7548 S 0 1.4 0:03.83 php5-fpm
25734 www-data 16 0 206m 14m 7400 S 0 1.4 0:03.73 php5-fpm
25950 root  15 0 70920 14m 1556 S 0 1.4 0:00.00 miniserv.pl
25730 www-data 15 0 206m 14m 7328 S 0 1.4 0:03.81 php5-fpm
25733 www-data 15 0 206m 14m 7072 S 0 1.4 0:03.68 php5-fpm
25731 www-data 15 0 205m 14m 8064 S 0 1.4 0:03.85 php5-fpm
25738 www-data 15 0 205m 13m 7368 S 0 1.3 0:04.01 php5-fpm
25727 root  15 0 203m 5244 1500 S 0 0.5 0:00.03 php5-fpm
25890 nobody 15 0 75012 3548 2664 S 0 0.3 0:00.00 dovecot-auth
25723 www-data 15 0 29132 3388 1548 S 0 0.3 0:03.54 nginx
25871 nobody 18 0 75048 3348 2444 S 0 0.3 0:00.00 dovecot-auth
28638 root  15 0 70600 3192 2476 S 0 0.3 0:00.00 sshd
25935 dovecot 18 0 18848 2364 1864 S 0 0.2 0:00.01 imap-login
32341 root  15 0 19552 2348 1628 S 0 0.2 0:00.06 bash
25832 root  15 0 37184 2248 1752 S 0 0.2 0:00.00 master
25834 postfix 18 0 39412 2228 1748 S 0 0.2 0:00.00 qmgr
25835 postfix 15 0 39248 2184 1716 S 0 0.2 0:00.00 pickup
29705 matthew 18 0 19368 2164 1628 S 0 0.2 0:00.00 bash
25929 dovecot 20 0 18692 2092 1656 S 0 0.2 0:00.00 managesieve-log
25934 dovecot 18 0 19556 2092 1660 S 0 0.2 0:00.00 imap-login
 9777 dovecot 15 0 18696 2088 1660 S 0 0.2 0:00.00 imap-login
25927 dovecot 18 0 18692 2088 1656 S 0 0.2 0:00.00 managesieve-log
25933 dovecot 18 0 18696 2088 1660 S 0 0.2 0:00.00 imap-login
25928 dovecot 20 0 18692 2084 1656 S 0 0.2 0:00.00 managesieve-log
25932 dovecot 21 0 18680 2076 1644 S 0 0.2 0:00.00 pop3-login
25930 dovecot 20 0 18680 2072 1644 S 0 0.2 0:00.00 pop3-login
25931 dovecot 21 0 18680 2072 1644 S 0 0.2 0:00.00 pop3-login
 7747 root  17 0 17852 1936 1456 S 0 0.2 0:00.00 bash
 9864 vmail  18 0 18056 1728 1272 S 0 0.2 0:00.01 imap
29698 matthew 18 0 70600 1572 836 S 0 0.1 0:00.20 sshd
 1 root  15 0 23300 1532 1236 S 0 0.1 0:01.99 init
25644 syslog 18 0 112m 1480 1076 S 0 0.1 0:00.00 rsyslogd
26494 root  15 0 19184 1336 1052 R 0 0.1 0:00.00 top
10108 root  15 0 19076 1316 1048 T 0 0.1 0:00.00 top
25713 nobody 15 0 135m 1232 848 S 0 0.1 0:00.00 memcached
25658 root  18 0 49248 1080 532 S 0 0.1 0:00.00 sshd
25722 root  25 0 28236 1060 268 S 0 0.1 0:00.00 nginx
25657 root  18 0 21064 1004 772 S 0 0.1 0:00.00 cron
25862 root  15 0 16892 752 504 S 0 0.1 0:00.00 dovecot
 7746 root  18 0 11204 360 236 S 0 0.0 0:00.00 vzctl

free -m


    total  used  free  shared buffers  cached
Mem:   1024  543  480   0   0   0
-/+ buffers/cache:  543  480
Swap:   0   0   0

cat /proc/user_beancounters


Version: 2.5
  uid resource      held    maxheld    barrier    limit    failcnt
  2062: kmemsize     13375069    14524110   2147483646   2147483646     0
   lockedpages      0     0    999999    999999     0
   privvmpages    139089    139987    262144    262144     0
   shmpages      8333     8348    131072    131072     0
   dummy       0     0     0     0     0
   numproc      73     80    999999    999999     0
   physpages     34655    35110     0   2147483647     0
   vmguarpages      0     0    131072    131072     0
   oomguarpages    34655    35110    131072   2147483647     0
   numtcpsock      22     234    7999992    7999992     0
   numflock      6     7    999999    999999     0
   numpty       2     2    500000    500000     0
   numsiginfo      0     2    999999    999999     0
   tcpsndbuf     422424    14858848   214748160   396774400     0
   tcprcvbuf     360448    3850520   214748160   396774400     0
   othersockbuf    286576    355744   214748160   396774400     0
   dgramrcvbuf      0     8472   214748160   396774400     0
   numothersock     177     189    7999992    7999992     0
   dcachesize     705189    916534   2147483646   2147483646     0
   numfile      2060     2302    23999976    23999976     0
   dummy       0     0     0     0     0
   dummy       0     0     0     0     0
   dummy       0     0     0     0     0
   numiptent      14     14    999999    999999     0

uname -a


Linux server.name.com 2.6.18-164.10.1.el5.028stab067.4 #1 SMP Thu Jan 14 21:23:12 MSK 2010 x86_64 GNU/Linux

High memory on virtual server

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