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[root@zetawiki ~]# cat /proc/sys/vm/drop_caches
0

[root@zetawiki ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          3881       1183       2698          0        156        617
-/+ buffers/cache:        408       3472
Swap:         6063          0       6063

[root@zetawiki ~]# echo 3 > /proc/sys/vm/drop_caches
[root@zetawiki ~]# cat /proc/sys/vm/drop_caches
3

[root@zetawiki ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          3881        365       3516          0          0         21
-/+ buffers/cache:        342       3538
Swap:         6063          0       6063