Subject: Re: Spectacular Train Wreck: WD DMA bad on tweaked Alpha...
To: Jason R Thorpe <thorpej@zembu.com>
From: Matthew Jacob <mjacob@feral.com>
List: port-alpha
Date: 05/29/2001 10:44:37
> On Tue, May 29, 2001 at 10:31:58AM -0700, Matthew Jacob wrote:
> 
>  > I think you need to do your own breakup in IDE.
> 
> Why do that when you could just have the upper layers hand down
> optimally-sized chunks for a given I/O device?

Well, if you *can* have devices reflect upwards their limitations fine. You
should structure it on a per-open basis (assume that optimal/maximal xfer size
changes per device).

In the interim, it's pretty broken. It works fine in FreeBSD :-) (ducks)