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Revisiting RDMA Reliability for Lossy Fabrics (DCP)#

SIGCOMM 2025 digest Program Core pick Coimbra · 8–11 September 2025

Abstract Paper Recording

Wenxue Li et al. (HKUST, Huawei)

Play the recording: Revisiting RDMA Reliability for Lossy Fabrics (DCP)

Why: Getting RDMA off PFC/lossless is one of the cycle's central transport problems and directly relevant to lossless-fabric work.

What: A switch+RNIC co-designed transport that is PFC-independent, RTO-free, packet-spray-compatible, and offload-friendly, claiming 1.6x/2.1x gains over SOTA lossless/lossy RDMA.

How: DCP-Switch adds a simple lossless control plane that DCP-RNIC uses for header-only-based retransmission and bitmap-free packet tracking; prototyped on Tofino2 + FPGA.

Where applicable: General DC RDMA technique, but requires coordinated switch and RNIC changes (prototype silicon), so deployment implies a fabric+NIC co-upgrade.