4/8/2023 0 Comments Windows afd service![]() ![]() ![]() GlobalMaxTcpWindowSize & TcpWindowSize are TCP values. This is calculated the same as DefaultReceiveWindow. This value is based on bytes of memory, this is why you multiply by 1024, 1024 = 1mb or memory.ĭefaultSendWindow - This is similar to DefaultReceiveWindow, but for the send side of connections. To find your optimum value: caps / 8 x 1024 i.e. For some applications, a larger value here gives slightly better performance at the expense of increased resource utilization. There is still one single value going in TCP packets, one value that will make the significant difference - the one reported by the Analyzer.ĭefaultReceiveWindow & DefaultSendWindow are AFD values (AFD.sys is the Ancillary Function Driver, which basically acts as an entry point for Winsock functions to get to TCPIP.sys.), not TCP values so they are calculated differently and effect your connection differently.ĭefaultReceiveWindow - The number of receive bytes that AFD buffers on a connection before imposing flow control. Some people might say that there are internal buffers in Windows reserved that you affect by changing those values. But then again, you can use 4 different values, up to you. With all those out of the way, the "DefaultSendWindow" for MS Windows does not matter, since it is negotiated by the other end of the connection, or the TCP Receive Window on the other end. Best I'd choose for your connection/MTU is RWIN=63888 You can safely make all those the same value. TcpWindowSize (actually 2 places in the registry for this)Īll 3 above settings affect that one value in TCP packets, the TCP Window that is negotiated at the end. Some of those settings in the Windows Registry supercede others, but at the end they all affect the same ONE value in TCP Headers (packets):Ģ. I say only one TCP Window value matters and that is the TCP Receive Window (or maybe DefaultReceiveWindow in Cablenut, not sure)įirst of all, there are 3-4 places in the Windows Registry affecting that one value in TCP Headers, in the actual packets.
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