Design and implementation of an RDMA-based data transmission system prototype for ETF

Data transmission is crucial in nuclear physics experiments. As the size of detectors and measurement data increases, traditional Ethernet protocols have become insufficient for performance requirements. To address this, a prototype data transfer system based on Remote Direct Memory Access (RDMA) is proposed. This system allows for direct data transfer between host memory devices, reducing resource consumption and improving throughput. It utilizes the RoCE v2 protocol to establish a stable RDMA session and incorporates Quality of Service (QoS) and priority-based scheduling tailored for nuclear physics applications, ensuring timely and reliable data transmission. Performance evaluations focus on latency, throughput, and CPU utilization at the External Target Facility (ETF). Results indicate that this solution outperforms TCP-based methods for large-scale data transfers, achieving a 96.3 % reduction in average latency, a 95.1 % improvement in throughput, and an 85.6 % decrease in CPU utilization, showcasing its superior performance and reliability.