[root@vm37 ~]# free -m
total used free shared buffers cached
Mem: 3881 3383 498 0 89 879
-/+ buffers/cache: 2415 1466
Swap: 991 53 938
[root@vm37 ~]# swapoff -a && swapon -a
[root@vm37 ~]# free -m
total used free shared buffers cached
Mem: 3881 3438 443 0 90 880
-/+ buffers/cache: 2467 1414
Swap: 991 0 991
[root@vm37 ~]#