Backpressure Flow Control
Prateesh Goyal, Preey Shah, Naveen Kr. Sharma, Mohammad Hossein Alizadeh, Thomas E. Anderson · 2019
Effective congestion control in a multi-tenant data center is becoming increasingly challenging with rapidly increasing workload demand, ever faster links, small average transfer sizes, extremely bursty traffic, limited switch buffer capacity, and one-way protocols such as RDMA. Existing deployed algorithms, such as DCQCN, are still far from optimal in many plausible scenarios, particularly for tail latency. Many operators compensate by running their networks at low average utilization, dramatically increasing costs.