在示例程序中,我发现了以下注意事项:
/* Hardware delivers at most ef_vi_receive_buffer_len() bytes to each
* buffer (default 1792), and for best performance buffers should be
* aligned on a 64-byte boundary. Also, RX DMA will not cross a 4K
* boundary. The I/O address space may be discontiguous at 4K boundaries.