Push Bit Interpretation
By default, Windows 2000 TCP/IP completes a recv() call when one of the following conditions is met:
Data arrives with the PUSH bit set
The user recv buffer is full
0.5 seconds have elapsed since any data has arrived
If a client application is run on a computer with a TCP/IP implementation that does not set the push bit on send operations, response delays may result. It is best to correct this on the client; however, a configuration parameter (IgnorePushBitOnReceives) was added to Afd.sys to force it to treat all arriving packets as though the push bit were set. This parameter was new in Windows NT 4.0 and is supported in Windows 2000.
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