Ethernet evaluation in data distribution traffic for the LHCb filtering farm at CERN

This paper evaluates the real-time distribution of data over Ethernet for upgraded LHCb acquisition cluster at CERN. The system commissioning ends in 2021 and its total estimated input throughput is 32 Terabits per second. After events are assembled, they must be distributed further selection to filtering farm online trigger. High-throughput very low overhead transmissions will an essential feature such a system. In this work RoCE (Remote Direct Memory Access Converged Ethernet) high-throughput protocol flow control algorithms have been used implement lossless event distribution. To generate LHCb-like traffic, custom benchmark has implemented. It was stress-test selected networks check resilience uneven workload Performance tests were made with evaluation clusters. 100 Gb/s 25 links used. results overall Ethernet-based approach discussed.