What is a TCP window? If the window is smaller than the network capacity, then the network will be underutilized. Most modern equipment can easily sustain data rates up to 1 Gbps in LAN environments with no more than ms of delay. When the bandwidth or delay is increased significantly, the default settings in most operating systems will prevent full utilization of the network.
What is the bandwidth-delay product, or BDP? To optimally utilize this network, the TCP window must be at least that large and it is recommended to start at twice the BDP. Remember that the round-trip time will increase as the pipe approaches full capacity so the BDP will increase as well. What is TCP window scaling? TCP window scaling is Chariot can set the socket buffer as high as the system maximum.
See questions 4 and 5 for system defaults and maximums. If you set the socket buffers higher than the system max, then the system will allocate the system maximum to each pair.
GlobalMaxTcpWindowSize sets the maximum window size that can be requested by an application. By default, this value does not exist and the system maximum is 64KB. Add this key under Parameters and set it to the maximum value of 1GB, 0x3fffffff. TcpWindowSize controls the default per-socket window size on a system-wide or per-interface basis. If you add this key under Parameters, then every socket will default to this value.
If it is added under a particular interface, then all connections on that interface will default to this value. If this value is not specified here, or in the script per 4 above , then the system default of 17KB will be used. How do I control packet size in TCP tests? There are three ways to control packet size in TCP tests. First, on systems that support it, the MSS option 9 is the best way to do this. The next best option is to force the MTU size as described in 10 and You may see erratic or low-performing behavior on some systems from using this method.
Some systems, like Linux, allow this to be adjusted at the socket level. Microsoft Windows does not allow per-connection modification of the MSS; it can only be modified by changing the actual MTU size of the interface.
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