The reason why you see low memory in the NetSight server. It is because of the disk caching.
Disk Caching makes the system much faster and it borrowing unused memory from the system. If application want more memory, they just take back that disk cache borrowed immediately. That’s the reason why it looks like you are low on memory but you are not.
Please noticed that Disk caching is used by Linux, not NetSight.
Here is the way how to see how much ram is free to use for your application, run “free –m” and look at “free” column in the row that say “-/+ buffers/cache”.