We implemented the NaNet FPGA-based PCI2 Gen2 GbE/APElink NIC, featuring GPUDirect RDMA capabilities and UDP protocol management offloading. NaNet is able to receive a UDP input data stream from its GbE interface and redirect it, without any intermediate buffering or CPU intervention, to the memory of a Fermi/Kepler GPU hosted on the same PCIe bus, provided that the two devices share the same upstream root complex. Synthetic benchmarks for latency and bandwidth are presented. We describe how NaNet can be employed in the prototype of the GPU-based RICH low-level trigger processor of the NA62 CERN experiment, to implement the data link between the TEL62 readout boards and the low level trigger processor. Results for the throughput and latency of the integrated system are presented and discussed.
Cite
@article{arxiv.1311.1010,
title = {NaNet:a low-latency NIC enabling GPU-based, real-time low level trigger systems},
author = {Roberto Ammendola and Andrea Biagioni and Riccardo Fantechi and Ottorino Frezza and Gianluca Lamanna and Francesca Lo Cicero and Alessandro Lonardo and Pier Stanislao Paolucci and Felice Pantaleo and Roberto Piandani and Luca Pontisso and Davide Rossetti and Francesco Simula and Marco Sozzi and Laura Tosoratto and Piero Vicini},
journal= {arXiv preprint arXiv:1311.1010},
year = {2015}
}
Comments
Proceedings for the 20th International Conference on Computing in High Energy and Nuclear Physics (CHEP)