Michael Zucca wrote:
>Riccardo Mottola wrote:
>> on 6/7/04 2:09 PM, Tim & Alethea Larson at thelarsons3@cox.net wrote:
>> 
>>>You want a Quadra, basically.  Fastest 68040 chips in Macs were 33MHz
>>>(630, 650, 800, 950 models) or 40MHz (840AV).  I've heard that the SCSI
>>>driver that NetBSD uses on the AV models is not as well developed
>> 
>> up to 1.6.2 it is still true...

>I've sent in preliminary DMA support for the AV's in the form of a PR. 
>However, the performance still isn't great because while the data gets 
>moved with the DMA engine instead of the CPU, the NCR SCSI chip doesn't 
>ship much data because it's stuck in asyc transfer mode. Some work needs 
>to happen to get synchronous transfers to work. If synchronous transfers 
>worked, I have no doubt that DMA transfers would be quite fast, even in 
>their preliminary state. Furhter optimizations could happen on the DMA 
>transfers after that but they are window dressing compared to getting 
>sync transfers to work.

Any chance of generating diffs of this ?

Robert Swindells