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User Datagram Protocol (UDP) is a commonly used protocol for datatransmission in small embedded systems. UDP as such is unreliable and packetlosses can occur. The achievable data rates can suffer if optimal packet sizesare not used. The alternative, Transmission Control Protocol (TCP) guaranteesthe ordered delivery of data and automatically adjusts transmission to matchthe capability of the transmission link. Nevertheless UDP is often favored overTCP due to its simplicity, small memory and instruction footprints. Both UDPand TCP are implemented in all larger operating systems and commercial embeddedframeworks. In addition UDP also supported on a variety of small hardwareplatforms such as Digital Signal Processors (DSP) Field Programmable GateArrays (FPGA). This is not so common for TCP. This paper describes how highspeed UDP based data transmission with very low packet error ratios wasachieved. The near-reliable communications link is used in a data acquisition(DAQ) system for the next generation of extremely intense neutron source,European Spallation Source. This paper presents measurements of UDP performanceand reliability as achieved by employing several optimizations. Themeasurements were performed on Xeon E5 based CentOS (Linux) servers. Themeasured data rates are very close to the 10 Gb/s line rate, and zero packetloss was achieved. The performance was obtained utilizing a single processorcore as transmitter and a single core as receiver. The results show thatsupport for transmitting large data packets is a key parameter for goodperformance.  Optimizations for throughput are: MTU, packet sizes, tuning Linux kernelparameters, thread affinity, core locality and efficient timers.

Achieveing reliable UDP transmission at 10 Gb/s using BSD socket for data acquisition systems