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Date: Tue, 01 Jun 2010 11:54:55 -0700
From: Darren Pilgrim <freebsd@bitfreak.org>
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To: Jeremy Chadwick <freebsd@jdc.parodius.com>
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Cc: amd64@freebsd.org, freebsd-fs@freebsd.org
Subject: Re: FreeBSD 8.1-Prerelease Panic amd64 w/ZFS..
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Jeremy Chadwick wrote:
> To the OP: you will need to increase vm.kmem_size in /boot/loader.conf
> and reboot the system.  "What value do I pick?"  With 4GB, I would
> recommend you use these two variables:
> 
> vm.kmem_size="2048M"
> vfs.zfs.arc_max="1536M"
> 
> This will increase the available kmem, and also limit the ARC size
> explicitly to nothing larger than 1.5GB.  This should stabilise your
> system.

What are the general guidelines for sizing these given the amount of 
physical RAM?  For example, I have a machine with 6 GB, so I have:

vm.kmem_size="3072M"
vfs.zfs.arc_max="2048M"