Date: Wed, 6 Sep 2000 09:48:48 -0500 (CDT) From: Guy Helmer <ghelmer@cs.iastate.edu> To: "Paul J. Dolan" <pdolan@metalab.unc.edu> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Increasing Shared Memory in 4.1 kernel Message-ID: <Pine.HPX.4.05.10009060945230.28496-100000@popeye.cs.iastate.edu> In-Reply-To: <Pine.GSO.4.21.0009051757160.12715-100000@titan.oit.unc.edu>
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On Tue, 5 Sep 2000, Paul J. Dolan wrote: > 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? Yes, if "sysctl -w kern.ipc.shmmax=XXX" works, the parameters are available. These parameters are apparently just undocumented in the sysctl man pages. > Setting these parameters and rebooting produced > no positive results. Set the parameters with sysctl but don't reboot. Or, create an /etc/sysctl.conf file with the lines I mentioned below, and then reboot. Hope this helps, Guy > 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... 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
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