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From: Matthias Gamsjager <mgamsjager@gmail.com>
Date: Wed, 11 Aug 2010 07:43:24 +0200
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To: "Vladislav V. Prodan" <universite@ukr.net>
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Cc: freebsd-fs@freebsd.org
Subject: Re: zfs arc - just take it all and be good to me
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> Please, insert into /boot/loader.conf only this options:
> vm.kmem_size="999M"
> vm.kmem_size_max="999M"
> vfs.zfs.arc_max="160M"
> vfs.zfs.prefetch_disable=1
>
> And after reboot, please run dd...

vfs.zfs.arc_max="160M" should be enough to limit the size of the arc.

and I'm not sure if that  ( vm.kmem_size="999M"
,vm.kmem_size_max="999M") is such a good idea.