Hello

I'm trying to implement CoDel-like implementation on Intel's DPDK library, but I have trouble with measuring packet sojourn time on RX/TX queues because of DMA usage. When I call send() function, DPDK puts the packets into DMA-region and I have no idea when the packets sent really into network. Likewise, when I call recv(), I don't have any idea when the packets arrived, so I'm not sure totally but I think I have no chance to measure sojourn time for dma-like implementation. Could you please correct me if I'm wrong. Also any comments/suggestions would be greatly appreciated. 

Thanks in advance..

- Volkan