From owner-freebsd-amd64@FreeBSD.ORG  Fri Oct  8 23:12:10 2010
Return-Path: <owner-freebsd-amd64@FreeBSD.ORG>
Delivered-To: freebsd-amd64@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id B38821065673
	for <freebsd-amd64@freebsd.org>; Fri,  8 Oct 2010 23:12:10 +0000 (UTC)
	(envelope-from sgk@troutmask.apl.washington.edu)
Received: from troutmask.apl.washington.edu (troutmask.apl.washington.edu
	[128.208.78.105])
	by mx1.freebsd.org (Postfix) with ESMTP id 7C1148FC0A
	for <freebsd-amd64@freebsd.org>; Fri,  8 Oct 2010 23:12:10 +0000 (UTC)
Received: from troutmask.apl.washington.edu (localhost.apl.washington.edu
	[127.0.0.1])
	by troutmask.apl.washington.edu (8.14.4/8.14.4) with ESMTP id
	o98NCAAb090211; Fri, 8 Oct 2010 16:12:10 -0700 (PDT)
	(envelope-from sgk@troutmask.apl.washington.edu)
Received: (from sgk@localhost)
	by troutmask.apl.washington.edu (8.14.4/8.14.4/Submit) id
	o98NCAF7090210; Fri, 8 Oct 2010 16:12:10 -0700 (PDT)
	(envelope-from sgk)
Date: Fri, 8 Oct 2010 16:12:10 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Kostik Belousov <kostikbel@gmail.com>
Message-ID: <20101008231210.GA90183@troutmask.apl.washington.edu>
References: <20101008221701.GA89977@troutmask.apl.washington.edu>
	<20101008222013.GT2392@deviant.kiev.zoral.com.ua>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20101008222013.GT2392@deviant.kiev.zoral.com.ua>
User-Agent: Mutt/1.4.2.3i
Cc: freebsd-amd64@freebsd.org
Subject: Re: linux32 sysctl limits?
X-BeenThere: freebsd-amd64@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Porting FreeBSD to the AMD64 platform <freebsd-amd64.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-amd64>,
	<mailto:freebsd-amd64-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-amd64>
List-Post: <mailto:freebsd-amd64@freebsd.org>
List-Help: <mailto:freebsd-amd64-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-amd64>,
	<mailto:freebsd-amd64-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 08 Oct 2010 23:12:10 -0000

On Sat, Oct 09, 2010 at 01:20:13AM +0300, Kostik Belousov wrote:
> On Fri, Oct 08, 2010 at 03:17:01PM -0700, Steve Kargl wrote:
> > 'man linux' does not list or describe the following sysctl
> > variables.
> > 
> > compat.linux32.maxvmem: 0
> > compat.linux32.maxssiz: 67108864
> > compat.linux32.maxdsiz: 536870912
> > 
> > Are there any limitations with setting these to
> > say 1G for stack and 4G for data on a system with
> > 16G of memory?
> 
> The linux ABI processes are 32bit, so you cannot reallistically assign
> 4Gb to maxdsiz. The space between data (bss) end and stack bottom is
> used for mappings, so it should be kept large enough.

Does this mean that maxssiz+maxdsiz=3G would allow 
1G for mappings?  The only linux app that will be
running is matlab (and I suppose any children processes
of matlab).

-- 
Steve