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Date: Thu, 28 May 2009 21:07:46 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: cpghost <cpghost@cordula.ws>
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Cc: freebsd-questions@freebsd.org
Subject: Re: superpages?
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>  [amd64, i386] The FreeBSD virtual memory subsystem now supports
>  fully transparent use of superpages for application memory;
>  application memory pages are dynamically promoted to or demoted from
>  superpages without any modification to application code. This change
>  offers the benefit of large page sizes such as improved virtual
>  memory efficiency and reduced TLB (translation lookaside buffer)
>  misses without downsides like application changes and virtual memory
>  inflexibility. This is disabled by default and can be enabled by
>  setting a loader tunable vm.pmap.pg_ps_enabled to 1.

very important change. i will have to check.
thank you very much