Subject: Re: how can kernel space expand to >1GB?
To: Ming Lei <mlei@Brocade.COM>
From: Jason Thorpe <>
List: tech-kern
Date: 07/31/2003 15:13:53
On Thursday, July 31, 2003, at 02:57  PM, Ming Lei wrote:

> On linux, there is an option called HIGHMEM support that enable the 
> kernel to access larger physical memory, more than 1GB on i386. The 
> way they do it, if I understand correctly, is that use a region in 
> kernel virtual space to dynamic mapping high physical memory.

NetBSD doesn't require any special options to do this.  You can still 
dynamically remap any part of RAM into the kernel virtual address 
space.  This is nothing really special -- it's basic functionality of 
the VM system.

         -- Jason R. Thorpe <>