Subject: Re: DMA
To: None <thorpej@nas.nasa.gov>
From: Mauricio Tavares <raub@kushana.aero.ufl.edu>
List: port-sun3
Date: 01/14/1996 20:32:02
While shopping for shruberries, Jason Thorpe pondered:
>
> On Sat, 13 Jan 1996 23:43:41 -0500 (EST)
> raub@kushana.aero.ufl.edu (Mauricio Tavares) wrote:
>
> > Where was I? Oh, yes. So I now have a 1GB SCSI2 drive attached
> > to the 3/50 replacing the CDC 96141-155. Currently, it takes quite a lot
> > of time to access the drive; for some reason it reminds me of a C64.
> > Would enabling the DMA "mode" speed up this drive so that I will be able
> > to load X in my lifetime?
>
> Definitely. I noticed _AMAZING_ performance improvements when I did this
> on my 3/60. Spin-waiting around a PIO transfer is ... horrifying :-)
>
Horrifying is a compliment; when I used the CDC drive it made me
think I was running netbsd in a Sinclair that had a tape drive instead of
a disk.
--
===========================+=============================================
| Mauricio Tavares | "We will attack... |
| raub@kushana.aero.ufl.edu | ...under the cover of daylight!" Rimmer |
===========================+=============================================