Fwd: NFS and Memory Buffers

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Dear Readers:

     My boss has entrusted me to analyze why the memory buffers are
not released a Linux server with Centos 6.4.?

    As informs me, the current reading is:


[root@bck ~]# free -m
             total       used       free     shared    buffers     cached
Mem:         15936      15788        147          0       6746        438
-/+ buffers/cache:       8604       7332
Swap:         2047          0       2047
[root@bck ~]#
[root@bck ~]#
[root@bck ~]# echo 3 > /proc/sys/vm/drop_caches && service snmpd
restart && free -m
Stopping snmpd:                                            [  OK  ]
Starting snmpd:                                            [  OK  ]
             total       used       free     shared    buffers     cached
Mem:         15936        509      15426          0         93         16
-/+ buffers/cache:        400      15536
Swap:         2047          0       2047
[root@bck ~]#

   I can not find the solution to release the memory buffer and cache
memory so grateful for any hint for finding the solution to this
"problem".

-Paul
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