Hi Sara,

Can you elaborate and provide some background context? Are you writing a dedicated storage application based on SPDK and DPDK? How does this application serve data to its clients (TCP, UDP, something else)?. Does the NIC you are using support scatter gather and TSO?

Generally speaking, zero copy (defined as one DMA from disk to host memory and then another DMA from host memory to the NIC) is possible given the right hardware.

Thanks,
Ben

On Mon, 2016-03-14 at 03:52 -0700, Saravana Kumar wrote:


Hi SPDK team

                 I want to know whether disk read(spdk) to network send(dpdk) can be done...if so how data can be read from disk and sent on network. lets say 2MB of data needs to be sent from disk to network then 2MB needs to be read and split on the dpdk send buffers or make 2MB/( number of dpdk send buffer)  calls to spdk ?
                 In the latter case copy can be avoided but number of spdk calls increases. Thanks team..

Regards,
Sara

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