Hardware/Software implementation factors influencing ethernet latency
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Universidade Federal de Minas Gerais
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Minimum Cycle Time is a common performance indicator adopted to compare Real-Time Ethernet protocols. Though serving its purpose, Minimum Cycle Time excludes the delays inside the sending and receiving nodes, so it is insufficient to estimate the end-to-end latency. In this work, we describe some implementation possibilities of an Ethernet node in a System-on-Chip and present measurements of the delay to send/receive packets from/to the application layer. We chose different points in the software to make the measurement, so the results cover more use-cases. We found the Ethernet Lite Media Access Controller (MAC) to be faster than the hard MAC (GEM) and the Lightweight IP stack to add less than 2.2 μs. Finally, we show how a hardware accelerator can reduce the delay of high-priority packets by 1.4 μs.
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Ethernet (Sistema de rede local de computação), Sistemas operacionais (Computadores)
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Delays , IP networks , Protocols , Software , Hardware , Clocks , Real-time systems, Industrial communication systems , real-time Ethernet , end-to-end latency, Performance Indicators , Application Layer , Hardware Accelerators , Data Rate , Transfer Rate , Data Transfer , Physical Layer , Packet Size , Protocol Stack , Device Memory , Host PC , Packet Processing, Industrial Internet of Things and Industry 4.0, Ethernet é uma tecnologia de rede que permite a conexão física entre computadores, impressoras e roteadores em redes locais (LAN)
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https://ieeexplore.ieee.org/document/8472002