Tcp checksum offload

Tcp checksum offload

TCP Checksum Offload is an option for a network adapter. If enabled, the adapter would be responsible of computing the checksum of the incoming or outcoming TCP messages, resulting the calculation reduce of the CPU. With the option enabled, the system would give a random value to fill the field of checksum in the TCP header before the message reaches the adapter.

However, based on ref.2, in some circumstances, some adapters can not calculate the checksum as fast as the CPUs faster than 400MHz.

Reference

# Wireshark, TCP Checksum Offload, [http://wiki.wireshark.org/TCP_checksum_offload http://wiki.wireshark.org/TCP_checksum_offload]
# IBM, TCP Checksum Offload, [http://publib.boulder.ibm.com/infocenter/systems/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/tcp_checksum_offload.htm http://publib.boulder.ibm.com/infocenter/systems/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/tcp_checksum_offload.htm]


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