Providing Near Per-Flow Scheduling in Commodity Switches Without Per-Flow Queues

Network quality of service (QoS) is essential for network applications. For many applications, getting a fair share available bandwidth their flows can prevent them from being blocked by other that do not respond to congestion. Providing per-flow scheduling in each output port commodity switch isolate the compete bottleneck link. Although maintain shares among competing flows, due high implementation costs providing queues switches, this capability rarely provided switches on market. To address need, we design and implement near-per-flow scheme named Near Per-flow Scheduling (NPFS) P4 programmable hardware evaluate its performance. NPFS provides effectiveness have ports. utilizes priority most dynamically assigns these based protocol types current sending rates. Experimental results show that, when number less than three times queues, guarantees achieved bandwidths only deviate ideal 5%.