how to explain this problem about snmp.

thanks all:

to pass snmpwalk get memory free size from windwos xp ,
the free memory size is different for windows that itself free memory size,
i used command : snmpwalk -v2c -c public myip 1.3.6.1.2.1.25.2.3.1.6
for example:
pass by snmp
200M=free memory size = total_memory_size - total_memory_used_size
pass by windows self (systeminfo)
210M ，
so i was very confused . why ?

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