Characterizing Off-path SmartNIC for Accelerating Distributed Systems
summary
A first holistic measurement of the off‑path SmartNIC BlueField-2 maps actual communication paths between client, on‑board SoC, NIC and host and finds concrete limits: off‑path traversal adds about +300 ns latency, PCIe switching and head‑of‑line effects throttle throughput, and RDMA versus SOC DMA trades latency for throughput. The paper uses microbenchmarks and PCI/DMA tracing to propose concurrent use of multiple paths and shows system gains on a SmartNIC file system and RDMA key‑value store LineFS 30% / DrTM-KV 25%.
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chapters (6)
- 0:00Introduction to SmartNICs
- 1:12RDMA and Offloading Challenges
- 3:42Characterizing SmartNIC Arches
- 5:54Performance Analysis of Paths
- 9:50Optimizing Concurrent Usage
- 12:20Guidelines and Conclusion
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