In the scenario where using an application which is not able to handle situations where the data is being sent in bursts.
The AFD-Send-Window should have the same value as the optimal TCPIP-Receive-Window to get the best upload-speed. In the scenario where using a network with high latency or high bandwidth the AFD-Send-Window will constantly be blocking the application's transfer if the AFD-Send-Window is set too low. * Default AFD Send- & Receive-Window = 8192 Bytes (If more than 19 MByte RAM) * Default AFD Send- & Receive-Window = 4096 Bytes (If less than 19 MByte RAM) When an application creates a socket it can specify a different AFD-Window than the default. The two default AFD-Windows is by default self tuning using the following values depending on the total amount of RAM detected. * AFD-Receive-Window: Used when the application is receiving data over a connection, if the application is not able to receive data fast enough or is blocked by other processing which keeps it from receiving data, then the AFD-Receive-Window will act as a buffer until it reaches the limit of the AFD-Receive-Window, where it will then block the remote-application from sending data. * AFD-Send-Window: Used when the application is sending data over a connection, if if more data is sent than the receiver is able to acknowledge then the AFD-Send-Window will block the transfer for the application, when it reaches the limit of the AFD-Send-Window. The AFD provides two windows which acts as a flowcontrol for the application creating the socket: The AFD provides the winsock interface, which is used by most network applications in Windows and is also supporting things like DNS and DHCP. "In the WinNT network architecture a layer is placed on top of the TCPIP layer called AFD(Ancillary Function Driver for Winsock). and with 2k / XP SP1 the analyzer will only read TcpWindowsize.īelow is a explenation on how AFD tweaking works, and why AFD parameters dont have to be multiple with MSS If you have windows XP SP2 installed, TCP analyzers will read your DefaultReceiveWindow as TcpWindowsize (RWIN). DefautReceivewindow is a AFD parameter and GlobalMaxTcpWindowsize, TcpWindowsize is a TCPIP parameter
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