On Sat, Feb 01, 2003 at 07:54:27PM +0100, Pavel Cahyna wrote:

 > Why this limit? Is this a heritage from PDP-11 with its (i think) 64kB address
 > space?

It's mostly historical baggage from the way e.g. the buffer cached used
to work.  The ability to access I/O buffers in the kernel is deeply
entrenched.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>