Re: Kernel panic on amd64Netbsd 4.0

[Paul Goyette <paul%whooppee.com@localhost>]

On Thu, 25 Sep 2008, Manuel Bouyer wrote:

> > Isn't there a kernel configuration option to limit the size of memory
> > used by NetBSD?  I don't see one for amd64 in boot(8), but I thought
> > I'd seen it before.
>
> I think it's
> options REALEXTMEM=integer
>
> at last for i386; never tested it on amd64.

I use

        options         PHYSMEM_MAX_ADDR=4096

on my amd64 with k8GB and it avoids numerous random crashed that I'd 
been having.

I was told at one point that there was a problem with bounce buffers 
over the 4GB limit, but then was told that that problem didn't exist. 
So, I'm not sure what the actual problem is, but limiting to 4GB does 
avoid the crashing.


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