About _real_ free memory

[Frederick, Fabian]

Hi,

	Someone could tell me how to know exactly how much free mem is
available on a box ?
I mean free memory drops quickly to default min_free (4 or 8mb).
Is there a way to clean cache from unwanted data or something to unlink the
stuff and
 regain some more 'free' mem. ?

Regards,
Fabian
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