Ho un server che 24 ore su 24 vive in queste condizioni:

top - 15:55:31 up 3:12, 1 user, load average: 2.28, 1.98, 1.87
Tasks: 56 total, 1 running, 55 sleeping, 0 stopped, 0 zombie
Cpu(s): 98.3% us, 1.1% sy, 0.0% ni, 0.2% id, 0.2% wa, 0.0% hi, 0.2% si
Mem: 224344k total, 220696k used, 3648k free, 11656k buffers
Swap: 931760k total, 2800k used, 928960k free, 136324k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4370 root 16 0 274m 28m 10m S 98.9 12.8 190:34.09 java
1 root 16 0 1584 512 452 S 0.0 0.2 0:00.61 init
2 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
3 root 10 -5 0 0 0 S 0.0 0.0 0:00.07 events/0
4 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 khelper
9 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kthread
18 root 20 -5 0 0 0 S 0.0 0.0 0:00.00 kacpid
104 root 10 -5 0 0 0 S 0.0 0.0 0:00.01 kblockd/0
138 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
139 root 16 0 0 0 0 S 0.0 0.0 0:01.76 pdflush
141 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 aio/0
140 root 15 0 0 0 0 S 0.0 0.0 0:00.72 kswapd0
731 root 25 0 0 0 0 S 0.0 0.0 0:00.00 kseriod
999 root 10 -5 0 0 0 S 0.0 0.0 0:00.01 reiserfs/0
1046 root 12 -4 1572 460 400 S 0.0 0.2 0:00.11 udevd
1479 root 15 0 0 0 0 S 0.0 0.0 0:00.00 khubd
3842 root 15 0 2568 864 732 S 0.0 0.4 0:00.00 dhclient

denis76@Magellano:/mnt/openspace$

Non mi è chiaro cosa sia la memoria bufferizzata.
Visto che comunque rimangono sempre circa 3 - 4 mega liberi voi aggiungereste ram?