win2k and scsi dma. help!

[borealiss]

ack. i can't get dma to be enabled in win2k for my aha-2940 uw2 scsi controller. it's integrated onto the motherboard. NT4 drivers are a no-go because they don't even install. my motherboard's a soyo sy-d6iba2. i notice disk access is better in win2k, but cpu usage is up to about 10% at peak usage, wheareas NT4 is was at most 5%. does anybody have any ideas about this? i tried adding the command line "DMAenabled" in the scsi port settings in the registry and setting the value to 1, but that does not work.

 

[MulLa]

I thought that DMA is only for ide devices? It allows devices to communicate directly with the memory without CPU intervention. Doesn't the chip on the scsi controller do that already? Therefore not requiring the DMA.

 

[Bartman39]

Thats a new one on me too... I`ve never heard of DMA & SCSI in the same sentence??? Other than maybe to compare??? Any SCSI guru`s know of this??? (I`ve had SCSI for 6-7 years and have no idea???)

 

[borealiss]

to my knowledge dma is just a way for any storage component to write to memory directly. scsi has the controller chip to handle most of the overhead, but eide has this also. i think dma was just associated with busmastering in general for any component. there is dma for scsi, i'm pretty sure about that. even in windows NT under my scsiport0 in my registry, there's a DMAenable key set to '1' with my hard drives and cdrw, all scsi, which are attached to it. i could be wrong. a program i have called configNT even says dma is enabled on my scsi adapter, and it says it's not enabled in win2k.