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    |
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