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Date: Wed, 18 Mar 2009 17:23:35 +0000
From: Ricardo Jesus <ricardo.meb.jesus@gmail.com>
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To: Espartano <espartano.mail@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Jail limits
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Espartano wrote:
> Hi folk, sorry for my bat english, i have a question:
> 
> there is any initiative to implements limits (like cpu limits, memory
> limits....) inside a jail ?
> 
> or already exists anything to do it ?
> 
> thanks a lot.
> 
> 
You can check sysctl MIB entries for security.jail.*

Using login.conf you can control resource limits and account limits. 
Take a look at man login.conf maybe it can help you on your situation.