4.2. Picking the Right TCP Rx/Tx Buffer Sizes
Obviously, larger Tx and Rx buffers deliver higher bandwidths, but at the cost of transport latency. Worse, NPAP Tx and Rx buffers require expensive FPGA BRAM resources. To help you pick a good tradeoff, here is the metric to determine TCP buffer sizes for TCP (keep in mind, TCP buffers are placed on both ends: Tx side and Rx side):
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