I try
root@wz:~# free -m
total used free shared buffers cached
Mem: 490 445 44 0 95 271
-/+ buffers/cache: 78 411
Swap: 0 0 0
why it’s only 44m free ram?
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The link @TheNumb provided explains what’s going on here. The Linux kernel will use any available memory for disk caching, unless it’s required by a running program. If needed by a program, the memory will be freed up. From the site Linux Ate My RAM:
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http://www.linuxatemyram.com/