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Date: Sun, 09 Sep 2007 03:51:26 +0200
From: Kris Kennaway <kris@FreeBSD.org>
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To: Peter Schuller <peter.schuller@infidyne.com>
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Cc: Simun Mikecin <numisemis@yahoo.com>, freebsd-fs@freebsd.org,
	freebsd-current@freebsd.org
Subject: Re: Swapping on ZFS - stability issue
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Peter Schuller wrote:
>> Try one of this (depends wheter you need encrypted swap or not):
>>
>> 1. create zvol with 4k blocksize instead of default 8k:
>>      zfs create -b 4k -V 4g tank/swap
>>      swapon /dev/zvol/tank/swap
> 
> Using a 4k blocksize did not seem to have an effect on the problem.
> 
> The test I am doing is with top in one virtual console and the test
> program on another. I keep refreshing top seeing memory use climb,
> until it starts hitting swap. After a few seconds, top hangs and the
> only indications of life are ping and the console.
> 

Please follow the directions in the developers handbook chapter on 
kernel debugging to obtain the relevant debugging information.

Kris