Why Linux always show high memory?

Have you ever wondered seeing high Linux memory utilization? Even if you are not running any memory intensive applications, top, sar always report above 90% memory utilization. Its because Linux uses free memory pool for caching disk blocks, so most of the free memory is  used for filesystem cache. But it frees up dynamically if an application requires real memory. You can get actual memory by using command free.

re-blogged from source

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