Elixir: A High-performance and Low-cost Approach to Managing Hardware/Software Hybrid
Talkat 19th USENIX Symposium on Networked Systems Design and Implementation (NSDI '22) · 2022-04-04..04-06·
summary
Elixir addresses how to split flow tables between hardware (smart NICs, P4 switches) and software (DPDK) under bursty traffic. It measures flow rates using a combination of sampling- and counter-based techniques, separates handling of long-lived large flows from bursty flows, and decouples the time windows for rate identification and for replacing flows in hardware. Implementations on Mellanox ConnectX-5 and Barefoot Wedge100BF P4 switches show up to ~50% CPU savings and large reductions in tail forwarding latency compared to prior methods.
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