From owner-freebsd-questions@FreeBSD.ORG  Thu Oct 17 15:27:51 2013
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id BC85F93A
 for <freebsd-questions@freebsd.org>; Thu, 17 Oct 2013 15:27:51 +0000 (UTC)
 (envelope-from frank2@fjl.co.uk)
Received: from bs1.fjl.org.uk (bs1.fjl.org.uk [84.45.41.196])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 42EAD2A14
 for <freebsd-questions@freebsd.org>; Thu, 17 Oct 2013 15:27:50 +0000 (UTC)
Received: from [192.168.1.35] (host86-163-34-162.range86-163.btcentralplus.com
 [86.163.34.162]) (authenticated bits=0)
 by bs1.fjl.org.uk (8.14.4/8.14.4) with ESMTP id r9HFRmmI005768
 (version=TLSv1/SSLv3 cipher=DHE-DSS-CAMELLIA256-SHA bits=256 verify=NO)
 for <freebsd-questions@freebsd.org>; Thu, 17 Oct 2013 16:27:48 +0100 (BST)
 (envelope-from frank2@fjl.co.uk)
Message-ID: <526001F5.1020505@fjl.co.uk>
Date: Thu, 17 Oct 2013 16:27:49 +0100
From: Frank Leonhardt <frank2@fjl.co.uk>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64;
 rv:17.0) Gecko/20130801 Thunderbird/17.0.8
MIME-Version: 1.0
To: freebsd-questions@freebsd.org
Subject: Re: warning: total configured swap (8960911 pages) exceeds maximum
 recommended amount (8243200 pages).
References: <201310171404.r9HE4ouQ018448@mech-cluster241.men.bris.ac.uk>
In-Reply-To: <201310171404.r9HE4ouQ018448@mech-cluster241.men.bris.ac.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Content-Filtered-By: Mailman/MimeDel 2.1.14
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 17 Oct 2013 15:27:51 -0000

On 17/10/2013 15:04, Anton Shterenlikht wrote:
> I'm using a 72gb swap disk.
> I've 10gb RAM
>
> I get this warning:
>
> warning: total configured swap (8960911 pages) exceeds maximum recommended amount (8243200 pages).
> warning: increase kern.maxswzone or reduce amount of swap.
>
> What is max. recommended amount based on?
> What is the danger of exceeding it?
> How should I increase kern.maxswzone?
>
> # sysctl kern.maxswzone
> kern.maxswzone: 0
> #
>
> Do I set it to the total swap size?
> Where is kern.maxswzone described?
>
>

I went through this on an earlier version but didn't get any warning. 
You might find the answer here:

http://blog.frankleonhardt.com/2011/large-swap-files-on-freebsd-die-with-mystery-killed-howto-add-lots-of-swap-space/

Regards, Frank.