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Old 06-05-2006, 09:38 PM
Kevin Irick
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Default Re: PCI Express and DMA

Alex,

I was wondering if you made anymore progress with the PCI Express DMA problem. I have a similar problem but it is concerning bursting of data from the host to the Endpoint. My Windows Driver sets up a buffer of data to be sent to the endpoint and initiates a block transfer. The chipset, however, breaks this block into multiple single DW transfers effectively killing performance. I believe that allowing the Endpoint to become the bus master and initiate block transfers by reading from the allocated buffer on the host will lead to better bus utilization. Do you have any ideas about this or any updates on your progress with DMA?

Thanks --Kevin
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