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Once you have the TCP stack tuned, you might still have a bottleneck in the Winsock layer. I have found that configuring Winsock (Ancillary Function Driver in the registry) makes a huge difference for upload speeds (pushing data to the server) in Windows 7. Microsoft has acknowledged a bug in the TCP autotuning for non-blocking sockets -- just the kind of ...


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On linux it is ping6 -s <packet_size> your.destination.com.


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Padding with zeroes is the only valid TCP header padding that I know of. (Not with F's. See RFC 793 dated 1981!) It has been this way for a long time. Windows XP did this as well. The only reason why your copy of Windows XP would not be doing this (that I can think of) is because of your NIC drivers. Make sure you're using the best network card drivers.



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