On Mon, Dec 16, 2002 at 08:25:50PM +1000, Ray Phillips wrote:
> 
> I managed to find the message I was thinking of:
> 
>   http://mail-index.netbsd.org/netbsd-help/1996/11/24/0001.html
> 
> in which Jason said
> 
>   "Unfortunately, with IDE, you don't get _any_ concurrency.  Quite 
>   honestly,
>    with IDE, you'd be better off with pure concatenation (interleave == 0)."
> 
> Is that the case even if only one disk is attached to each IDE 
> controller, or only for a ccd made from two disks, both on the same 
> controller?

This was in 1996, at this time NetBSD didn't support IDE DMA.
Now you can get concurency with IDE, if you have one drive per channel, and
your drives and controllers are DMA-capable.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 23 ans d'experience feront toujours la difference
--