From owner-freebsd-hackers@FreeBSD.ORG  Sun Mar 30 20:30:34 2014
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 78F024BC
 for <freebsd-hackers@freebsd.org>; Sun, 30 Mar 2014 20:30:34 +0000 (UTC)
Received: from mail-we0-x22a.google.com (mail-we0-x22a.google.com
 [IPv6:2a00:1450:400c:c03::22a])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 10CD3819
 for <freebsd-hackers@freebsd.org>; Sun, 30 Mar 2014 20:30:33 +0000 (UTC)
Received: by mail-we0-f170.google.com with SMTP id w61so4018786wes.1
 for <freebsd-hackers@freebsd.org>; Sun, 30 Mar 2014 13:30:32 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=googlemail.com; s=20120113;
 h=date:from:to:subject:message-id:in-reply-to:references:mime-version
 :content-type:content-transfer-encoding;
 bh=QIHvapwooPxM0fmW1QmV/1FIu89ke3Dr5nlZqogXuYc=;
 b=0/jVgPYrsZgPtmAl8V0bA+e5Or3YfCbRc/2sEVLSn60o+y8jkZxz8D2M76VNYUUhcS
 CDvblfUStYgU2jaRtUjKSxfo3GpBkPW7JBVVzVEEKdMXwBipNO7Ri6DykO7BmzESQyRu
 ZioSRSYnvN92+RKN/9pGaLQNa4l6DJ4elWDfcyppHSEJuHOmb8bxz5dy8ZKjBTF/pN31
 IIWX/TGlrSz8eAUCSDvc9vRq00ZlIjCpk8OL5NsURMCAYcQ/Gbd351wmtgeS66nuJ/ef
 rkRGkLs5tQSyci3TzoBGlpcJ+SxNuVj8pjp+iFnDc2+a3sfI9hi7+HHLFkkI/m840jHa
 olqw==
X-Received: by 10.194.174.197 with SMTP id bu5mr497989wjc.71.1396211432310;
 Sun, 30 Mar 2014 13:30:32 -0700 (PDT)
Received: from gumby.homeunix.com (5ec2dcc4.skybroadband.com. [94.194.220.196])
 by mx.google.com with ESMTPSA id cl9sm9347210wjc.25.2014.03.30.13.30.30
 for <freebsd-hackers@freebsd.org>
 (version=SSLv3 cipher=RC4-SHA bits=128/128);
 Sun, 30 Mar 2014 13:30:31 -0700 (PDT)
Date: Sun, 30 Mar 2014 21:30:28 +0100
From: RW <rwmaillists@googlemail.com>
To: freebsd-hackers@freebsd.org
Subject: Re: kern.maxswzone
Message-ID: <20140330213028.261022f4@gumby.homeunix.com>
In-Reply-To: <alpine.BSF.2.00.1403072155140.5678@wojtek.tensor.gdynia.pl>
References: <alpine.BSF.2.00.1403072155140.5678@wojtek.tensor.gdynia.pl>
X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.22; amd64-portbld-freebsd10.0)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 30 Mar 2014 20:30:34 -0000

On Fri, 7 Mar 2014 21:57:05 +0100 (CET)
Wojciech Puchar wrote:

> i configured 4.7GB swap on 512MB computer and i see in logs
> 
> warning: total configured swap (1249880 pages) exceeds maximum
> recommended amount (986496 pages). warning: increase kern.maxswzone
> or reduce amount of swap.
> 
> 
> fine, but after increasing maxswzone to 60000000 from less than 40 
> millions of default, no difference in message


kern.maxswzone can only be used to reduce the space used below the
default, not increase it. According to loader(8) the default allows for
a swap size of 8x ram. However, it's not an exact calculation, and there
is a safety margin, so you may be OK if you ignore the warning.