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Date:      23 Sep 2002 14:08:11 -0400
From:      Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
To:        Nicholas Esborn <nick@netdot.net>
Cc:        Kris Kennaway <kris@obsecurity.org>, freebsd-questions@FreeBSD.ORG
Subject:   Re: Practical limit for pre-loaded md_image size?
Message-ID:  <441y7ksho4.fsf@be-well.ilk.org>
In-Reply-To: <20020922201441.GB54982@carbon.berkeley.netdot.net>
References:  <20020922081120.GA54982@carbon.berkeley.netdot.net> <20020922181917.GB46345@xor.obsecurity.org> <20020922201441.GB54982@carbon.berkeley.netdot.net>

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Nicholas Esborn <nick@netdot.net> writes:

> I've tried this on two machines:
> 
>  1 4.7-RC w/ 512 MB of RAM
>  2 5.0-CURRENT w/ 256 MB of RAM
> 
> Both behave the same way with a ~128MB md_image.

Did you check the manual?  It says: "The default maximum size of a md
disk backed by malloc(9) is 20,000 sectors of 512 bytes each.  This
can be changed with the kernel option MD_NSECT." 

> -nick
> 
> On Sun, Sep 22, 2002 at 11:19:18AM -0700, Kris Kennaway wrote:
> > On Sun, Sep 22, 2002 at 01:11:20AM -0700, Nicholas Esborn wrote:
> > > Hello,
> > > 
> > > I've been trying to boot a kernel and a preloaded md_image of about 128MB.
> > > 
> > > The kernel and image load, and then about a quarter of a second after the
> > > kernel executes, before any text even prints, the machine reboots.
> > > 
> > > Has anyone had better luck with large md_image root filesystems?
> > 
> > You forgot to mention how much RAM you have, and what FreeBSD version.

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