Subject: Re: comparing raid-like filesystems
To: Pavel Cahyna <email@example.com>
From: David Laight <firstname.lastname@example.org>
Date: 02/01/2003 19:22:33
On Sat, Feb 01, 2003 at 07:54:27PM +0100, Pavel Cahyna wrote:
> > Right now we are limited to MAXPHYS (64k) for each "disk".
> Why this limit? Is this a heritage from PDP-11 with its (i think)
> 64kB address space?
I doubt it, you would never want to allocate a buffer that big
on a system with only 16bit addressing, even if the MMU supports
256k+ of physical memory.
Or possibly other systems that cannot DMA across 64k boundaries.
- except would they be scatter gather transfers?
David Laight: email@example.com