Doc error - sysctl

[Paul Goyette <paul%whooppee.com@localhost>]

It seems that kern.maxvnodes is dodcumented as "cannot be lowered"

   kern.maxvnodes (KERN_MAXVNODES)
           The maximum number of vnodes available on the system.  This can
           only be raised.

However, the kernel allows you to lower the value, and it helps if
you want to flush file cache (free up active memory).


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