This is not about performance, but about providing the ability for users to 'implant' their own memory buffers. CUSP doesn't allow it (which was the initial point of this thread).

Thanks. Sorry I missed that. Given CPU memcpy is an order of magnitude more bandwidth than PCI offload, I still don't get the point, but I don't need to.

User-provided GPU memory buffers. CUDA buffers. Avoiding PCI Express ;-) Best regards, Karli