After the handshake, the client sends an HTTP GET request to the server, which is quickly processed. For many applications, since clients tend to receive data rather than send it, clients often have a larger allocated window size. In this example, the client has a TCP receive window of 65,535 bytes, and the server has 5,840. Each TCP header will display the most recent window value, which can grow or shrink as the connection progresses. In the above diagram, the client and server are advertising their window size values as they communicate. This will alert the sender that it needs to reduce the amount of data sent or allow the receiver time to clear the buffer. If the receiver is not able to process the data as fast as it arrives, gradually the receive buffer will fill and the TCP window will be reduced in the acknowledgment packets. This field tells the link partner how much data can be sent on the wire before an acknowledgment is received. The size of the TCP Receive Window is communicated to the connection partner using the window size value field of the TCP header. Simply put, it is a TCP receive buffer for incoming data that has not been processed yet by the application. The 5 factors which slow down data transfers and how to identify them.What’s the impact of TCP events on application performance?. ![]() ![]() Why should you care about TCP windowing? Because it drives the speed of data transfers and hence the experience of your users accessing the applications, as described in these two other articles: This article discusses the concept of the TCP receive window.Īfter considering how the TCP retransmission mechanism works, we will now examine TCP receive windows and how they can impact performance. This is the fourth article in a series of articles (see a full list at bottom of page) covering TCP core concepts to effectively troubleshoot performance problems impacting applications.
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