GPU-Centric Stateless LLM Serving With GIGANETS

Abstract

Giganetes is a GPU-centric architecture for stateless LLM serving that externalizes KV caches to a disaggregated remote memory pool via GPUDirect RDMA. By treating remote memory as a GPU-addressable tier via GPUDirect RDMA, Giganetes eliminates session affinity constraints: any GPU can serve any request, enabling near-linear horizontal scaling in a Kubernetes-native deployment. A Scatter/Gather I/O interface bypasses the CPU and host memory entirely, achieving 52.4 GB/s application-level read throughput on our 4×200 Gbps RDMA testbed. A session-level metadata abstraction and proactive readahead mechanism reduce GPU bubbles by overlapping remote KV fetches with prefill computation and scheduling slack. On a 4-node H800 cluster, Giganetes delivers 33% higher throughput (QPS 2.4 vs. 1.8) and 1.75× lower P95 TPOT than PD-disaggregation with sticky sessions, with the gain driven by scheduling flexibility rather than faster transport alone.