Subject: Re: changes in asc driver from 1.5.4 to 1.6.1
To: Toru Nishimura <locore32@gaea.ocn.ne.jp>
From: Manuel Bouyer <bouyer@antioche.eu.org>
List: port-pmax
Date: 07/06/2003 20:07:12
On Sun, Jul 06, 2003 at 10:44:06AM +0900, Toru Nishimura wrote:
> > cd0: async, 8-bit transfers
> >
> > sd0 used to go 3.5MB/s sync, and as you can see, after first disk access
> > all the disks get renegotiated as async.
> >
> > maybe it's something as simple as a timeout that needs to be extended?
> 
> I'm afraid not.  I can not recall whether NetBSD/pmax 1.5.4 was equiped with
> its own asc driver.  NetBSD/pmax 1.6 features MI NCR driver which
> is common across other ports, and it does not necessary mean achieving best
> performance from particular hardware combinations.  I suggest you to make sure;

It should, it's just a matter of passing the right informations from the
front-end to the MI driver.
FWIW, on sparc , the old ncr driver negotiated full sync for some
device/hardware, the new reports lower sync rates (or async). After
investigations, it appears that the old driver lied.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 24 ans d'experience feront toujours la difference
--