Method and system for TCP large segment offload with ack-based transmit scheduling
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United States of America Patent
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Dec 25, 2007
Grant Date -
May 20, 2004
app pub date -
Nov 18, 2002
filing date -
Nov 18, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method and system for offloading the transmission of large blocks of data from Transmission Control Protocol residing on a transmitting host computer to an intelligent network interface card (NIC) that schedules and performs transmittals. The NIC receives a pointer to the location of data to be transmitted, partitions the data into packets and writes sequence numbers in the headers of the packets. The NIC receives acknowledgements (ACKs) from the recipient system which contain a window size and beginning sequence number for the next transmittal. Provided the ACK indicates appropriate forward progress, the NIC continues to transmit until its buffer is empty. By allowing the NIC to process many packets in this fashion, significant burden is taken off the host computer system. In case of no forward progress, as evidenced by a duplicate ACK, or of an empty buffer, NIC returns control to the transmitting host computer for further action.
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