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Date: Thu, 04 Jun 2009 20:28:32 +0200
From: Angelo Turetta <aturetta@commit.it>
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To: Tim Chase <tim@chase2k.com>
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Cc: freebsd-stable@FreeBSD.org
Subject: Re: kmem map too small panic after updating to STABLE-7 r192996
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Tim Chase wrote:
> Hello,
> 
> I decided to give the new zfs code a try and upgraded my stable-7 system
> and discovered a panic that I can reproduce at will.

I just had the same problem, and it turned out I was not diligent when I 
first set my zfs pool up :)

To use vm.kmem_size="512M" you need to put

  options         KVA_PAGES=512

in your kernel. I remember trying the loader.conf settings on a GENERIC 
kernel, found it worked and forgot to add KVA_PAGES. It seems that 
recently the memory allocated by a ZFS kernel on startup has become 
larger than the default KVA_PAGES in GENERIC.

Hope this helps,
Angelo Turetta