memory usuage

[root@new-host 2 ~]# free -m
             total       used       free     shared    buffers     cached
Mem:           997        255        742          0          1         17
-/+ buffers/cache:        235        761
Swap:         2015        132       1883

1) Can some one explains whats is the difference between buffer/cache in 1st and 2nd line.

2) also i noticed swap is used 132 M when we have 742 MB free MB available. Please advise.
ittechlabLinux SupportAsked:
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Rajesh NandanwarCommented:
Used memory in the first line includes that devoted to the buffers and cache. In second line, the System shows, how much Memory surely is free - free in the first line is only unused memory. In first line, it shows used buffered and cached memory. In second line, it shows mem-usage without buffered and cached memory, because buffers and caches are not fix.


Here's some more information: http://www.perlmonks.org/?node_id=712434

Also, you have a small amount of physical RAM in your box. Linux will try and keep a percentage of ram free so it has swapped out some stuff to allow the system to have memory when it is needed.
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