Michael R. Zucca wrote:

> 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.


I knew I had heard someone was working on this issue...  :)

Has any of this been incorporated anywhere?  I assume you build your own 
custom kernels to test.  Is "still isn't great" better than it was 
otherwise?

Tim

-- 
Tim & Alethea
www.ChristTrek.org