>> I loaded up wireshark to see what was happening. >> >> 192.168.1.26 is my desktop computer running windows. >> 192.168.1.192 is the embedded system that's using lwIP. >> >> 2578 207.992115 192.168.1.192 192.168.1.26 Gryphon 1422 - Invalid - >> 2581 208.194336 192.168.1.26 192.168.1.192 TCP 54 afs3-fileserver > patrolview [ACK] Seq=1 Ack=1369 Win=64400 Len=0 >> ... >> 2588 208.200927 192.168.1.192 192.168.1.26 TCP 1314 [TCP segment of a reassembled PDU] >> 2590 208.397469 192.168.1.26 192.168.1.192 TCP 54 afs3-fileserver > patrolview [ACK] Seq=1 Ack=8101 Win=63140 Len=0 >> >> It seems that I currently send things quicker than the desktop is ACKing ... >>
200ms delays are a smoking gun for a Nagling problem on Windows. In the registry, walk through the GUIDs at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\servic es\Tcpip\Parameters\Interfaces to find the IP address of the connection to the embedded system. Then create two new values: TcpAckFrequency=1 (DWORD32) and TCPNoDelay=1 (DWORD32). Here is a good discussion: http://lifeandcode.net/2009/05/reduce-game-network-latency-in-windows-7- or-vista/ There may also be other issues, but check that anyway. Marty
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