Hello, I guess writing to this list is a rather long shot, but I have no idea where else to start. I would be extremely grateful for any pointers you can give me, whatever it is. I would like to transfer data between a PXI card (a digitizer, to be precise) and a PCI express card (an Nvidia Tesla GPU) as fast as possible. Is it possible to have two cards write into each others memory directly, without ever involving the host CPU? If I wanted to implement this, where would I have to start? Do I need to go to kernel space? Or are there API functions that I can use from userspace? I already found out that I can connect the PXI bus to either the PCI or PCI Express bus of the host computer using a bus extender. Is there a difference between these two variants as far as communicating with other PCIe cards is concerned? Finally, can someone give me an order-of-magnitude estimate of how the latencies that will be involved in such a transfer? How long will it take to transfer 90 16bit samples from one card to the other? Best, -Nikolaus -- ÂTime flies like an arrow, fruit flies like a Banana. PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
