From owner-freebsd-questions  Tue Sep  5 15: 5: 0 2000
Delivered-To: freebsd-questions@freebsd.org
Received: from luna.oit.unc.edu (luna.oit.unc.edu [152.2.22.4])
	by hub.freebsd.org (Postfix) with ESMTP id 8057737B422
	for <freebsd-questions@FreeBSD.ORG>; Tue,  5 Sep 2000 15:04:57 -0700 (PDT)
Received: from titan.oit.unc.edu (titan.metalab.unc.edu [152.2.210.14])
	by luna.oit.unc.edu (8.9.3/8.9.3) with ESMTP id SAA29567;
	Tue, 5 Sep 2000 18:03:23 -0400 (EDT)
Received: from localhost (pdolan@localhost)
	by titan.oit.unc.edu (8.8.6/8.8.6/rchk1.19) with ESMTP id SAA15398;
	Tue, 5 Sep 2000 18:04:55 -0400 (EDT)
X-Authentication-Warning: titan.oit.unc.edu: pdolan owned process doing -bs
Date: Tue, 5 Sep 2000 18:04:54 -0400 (EDT)
From: "Paul J. Dolan" <pdolan@metalab.unc.edu>
X-Sender: pdolan@titan.oit.unc.edu
To: Guy Helmer <ghelmer@cs.iastate.edu>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Increasing Shared Memory in 4.1 kernel
In-Reply-To: <Pine.HPX.4.05.10009051602010.10351-100000@popeye.cs.iastate.edu>
Message-ID: <Pine.GSO.4.21.0009051757160.12715-100000@titan.oit.unc.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Hi Guy,

Thanks for the quick response.  Unfortunately,
I don't see 
  kern.ipc.shmmax
  kern.ipc.shmall
as valid parameters in `man sysctl`

If they do not show up as available in 
my sysctl manual are they actually available?
Setting these parameters and rebooting produced
no positive results.

FreeBSD 
4.0-RELEASE FreeBSD 4.0-RELEASE #0: 
Tue Sep  5 15:26:22 EDT 2000
i386

Do you have any further advice?

Thanks,

Paul J. Dolan

On Tue, 5 Sep 2000, Guy Helmer wrote:

> On Tue, 5 Sep 2000, Paul J. Dolan wrote:
> 
> > Hi, 
> > 
> > I'm trying to increase the default Shared Memory
> > Max Segment Size in the 4.1 kernel.  
> > 
> > Right now the limit seems to be 4 MB.
> > Does anyone have notes on how to rebuild
> > the kernel to allow for up to 64 MB segments?
> 
> I've made similar changes without having to rebuild the kernel by changing
> the sysctl parameters via /etc/sysctl.conf:
> 
> kern.ipc.shmmax=67108864
> kern.ipc.shmall=32768
> 
> These particular values for these parameters allow for about 50 megabytes,
> according to a program that searches for the largest block of shared
> memory that it can allocate.  Try increasing these values a bit so you can
> obtain 64MB segments...
> 
> Hope this helps,
> Guy
> 
> Guy Helmer, Ph.D. Candidate, Iowa State University Dept. of Computer Science 
> Research Assistant, Dept. of Computer Science   ---   ghelmer@cs.iastate.edu
> http://www.cs.iastate.edu/~ghelmer
> 
> 



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message