KV Cache Transfer Over RDMA Between Prefill and Decode Nodes
Push mode RDMA writes and pull mode reads create a 98x throughput gap on identical hardware.
Tobias Wrenfeld
Section
4 stories in High-Speed Interconnects.
Push mode RDMA writes and pull mode reads create a 98x throughput gap on identical hardware.
Configuring ECN, DCQCN, and PFC settings correctly is essential for preventing fabric bottlenecks.
Bypassing the CPU with RDMA and GPUDirect lets networks, not software, limit training speed.
RDMA removes CPU bottlenecks from LLM data movement across inference and training.