An underrun error on an ethernet is a transmission error. The way most ethernet chips transmit packets is that they DMA packet data from memory into their internal transmit fifo for sending. They do not ususally load the entire packet into the fifo before transmitting (some may have fifos smaller than the max. pkt size), so they go grab the data as they need it - there is usually a low-water mark in the fifo which triggers this. A transmit fifo underrun will occur if the ethernet chip cannot obtain the local bus in order to get more packet data for the fifo, and the fifo becomes empty before the end of the packet has been reached.
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