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Datacenter switching hardware trends are delivering higher bisectionbandwidth but not proportionally larger SRAM packet buffer capacity. The lackof buffer space challenges congestion control protocols to combine high linkutilization and minimal queuing. Additionally, protocols must ensure lowlatency delivery, ease of deployment, and robust handling of congestion acrossall possible bottlenecks.  We present SIRD, a datacenter transport that fulfills all these requirementsby combining receiver-driven (RD) scheduling with a sender-informed (SI)control loop that optimizes credit allocation. The combined approach, informedovercommitment, achieves both high throughput and minimal buffering because itallows receivers to efficiently allocate a very limited amount of credit. Sincelittle credit is used, receivers face little inbound traffic which minimizesin-network buffering. As such, SIRD can deliver messages with low latencywithout having to reserve Ethernet priorities. In addition to senderinformation, SIRD integrates network feedback into scheduling decisions andexplicitly deals with core congestion, a typical limitation of end-to-end RDprotocols.  We compare SIRD to two state-of-the-art receiver-driven protocols (Homa anddcPIM) and two production-grade reactive protocols (Swift and DCTCP) and showthat SIRD is the only one that can consistently maximize link utilization,minimize queuing, obtain near-optimal latency across a wide set of workloadsand traffic patterns, and never suffer from congestion collapse under highload. SIRD causes 13% less peak buffering than Homa and achieves competitivelatency and utilization without requiring Ethernet priorities. Unlike dcPIM,SIRD operates without latency-inducing message exchange rounds and outperformsit in utilization, buffering, and tail latency by 9%, 44%, and 46%respectively.

SIRD: A Sender-Informed, Receiver-Driven Datacenter Transport Protocol