Papers › Metronome: adaptive and precise intermittent packet retrieval in DPDK
Metronome: adaptive and precise intermittent packet retrieval in DPDK
Marco Faltelli, Giacomo Belocchi, Francesco Quaglia, Salvatore Pontarelli, Giuseppe Bianchi
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The increasing performance requirements of modern applications place a significant burden on software-based packet processing. Most of today's software input/output accelerations achieve high performance at the expense of reserving CPU resources dedicated to continuously poll the Network Interface Card. This is specifically the case with DPDK (Data Plane Development Kit), probably the most widely used framework for software-based packet processing today. The approach presented in this paper, descriptively called Metronome, has the dual goals of providing CPU utilization proportional to the load, and allowing flexible sharing of CPU resources between I/O tasks and applications. Metronome replaces DPDK's continuous polling with an intermittent sleep&wake mode, and revolves around a new multi-threaded operation, which improves service continuity. Since the proposed operation trades CPU usage with buffering delay, we propose an analytical model devised to dynamically adapt the sleep&wake parameters to the actual traffic load, meanwhile providing a target average latency. Our experimental results show a significant reduction of the CPU cycles, improvements in power usage, and robustness to CPU sharing even when challenged with CPU-intensive applications.
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