Longhorn v2 on SPDK: TCP catches up, RDMA still wins on latency (part 1)
Two snapshots of Longhorn’s SPDK-based v2 engine on the same three Ampere nodes: 1.12 with my RDMA patches, then 1.14 development builds with a newer SPDK. NVMe/TCP got about 7× lower write latency and now fills a 25 GbE link. RDMA still halves write latency.