From owner-freebsd-fs@FreeBSD.ORG  Thu Oct 18 06:11:03 2007
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Date: Wed, 17 Oct 2007 23:11:09 -0700
From: Darren Reed <darrenr@freebsd.org>
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To: Pawel Jakub Dawidek <pjd@FreeBSD.org>
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Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org
Subject: Re: ZFS kmem_map too small.
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So, I just had another of these panics:

panic: kmem_alloc(131072): kmem_map too small: 400011264 total allocated

what I did to provoke it:
zfs rollback room/freebsd@presnap

 From loader.conf:
vm.kmem_size=536870912
vm.kmem_size_max=536870912
vfs.zfs.arc_max=409715200
vfs.zfs.prefetch_disable="1"

Darren