Date: Mon, 14 May 2007 00:12:23 -0700 From: "Kevin Downey" <redchin@gmail.com> To: "freebsd-questions@freebsd.org List" <freebsd-questions@freebsd.org> Subject: Re: mdconfig -t malloc limits Message-ID: <1d3ed48c0705140012v7ade1c8fo769999f87665df44@mail.gmail.com> In-Reply-To: <20070514070405.GA70600@xor.obsecurity.org> References: <1d3ed48c0705132134t4a677c14kfca30c5ee10881f8@mail.gmail.com> <20070514070405.GA70600@xor.obsecurity.org>
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On 5/14/07, Kris Kennaway <kris@obsecurity.org> wrote: > On Sun, May 13, 2007 at 09:34:46PM -0700, Kevin Downey wrote: > > I am building a shiny new desktop, the only thing I don't have right > > now is the hard drive, so > > I have been booting a minimal system off a flash drive. The box has > > two gigs of ram. if I try to create a malloc backed md device bigger > > then 300mb(this is not the exact limit but it is between 300mb and > > 400mb) it fails. If I use -o reserve the mdconfig command fails and if > > I don't then when I try and use that space FreeBSD crashes. It seems > > like there should be enough unused memory to create a 1gb malloc > > backed md. > > > > I have no swap because the only drive is a flash drive. > > / is mounted read only. > > /tmp and /var are 124mb malloc backed md devices > > > > What is the deal? Is this some tunable limit? Should I fire up memtest? > > See the manpage, or the archives for extensive discussion. Bottom > line: you almost certain don't want to use malloc backing, but instead > swap backing. > > Kris > using: mdconfig -a -t swap -s 500m -o reserve I get: mdconfig: ioctl(/dev/mdctl): Numerical argument out of domain in fact I get the same message no matter what size I pick. I had assumed that since I don't have a swap partition setup that using a backing method called 'swap' wasn't a good idea. -- "The biggest problem with communication is the illusion that it has occurred." G. B. Shaw www.thelastcitadel.com
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