Harmonic: Hardware-assisted RDMA Performance Isolation for Public Clouds
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18·
summary
Claims a deployable hardware–software design that enforces RDMA performance isolation by measuring and throttling at the PCIe boundary. Implements a programmable PCIe p-switch that maps PCI transactions to tenant objects, kernel-side physical-address mappings, and a daemon that sends periodic CMPs to repurposed NIC rate limiters to cap request rate. Prototype shows measurement error <0.3%, isolates victims where SR-IOV and traffic classes fail, and improves protected throughput by about 1.3–1.4× with no NIC or application changes.
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