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===== TCP Segmentation Offload ===== '''github.com/wdebruij/kerneltools/blob/master/tests/tso.c''' can deterministically craft TSO packets of specific size and content. A full testsuite that uses this to test all interesting cases is a work in progress. Common case TSO packets can be tested by generating a TCP stream and measuring byte- and packet counts. This requires care: packet count as reported by the device must report counts after segmentation, so cannot be used to report the number of TSO packets. On Linux, packets observed with tcpdump or similar tools are observed before TSO, but also before possible software segmentation, so cannot be trusted. The correct counter is the device '''lso_counter'''. Additionally it is possible to count the number of ndo_start_xmit invocations using ftrace. <span id="udp-segmentation-offload-1"></span>
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