TCP Global Synchronization

TCP Global Synchronization describes a periodic increase and decrease in the data throughput of TCP connections. In this case, this behavior occurs in isolation occurs on single TCP connection, but synchronized on all TCP connections of a system.

The cause of this synchronous behavior is due as a method of congestion control in which the network scheduler then deletes the data packets when the buffer is full and there is no room for them in the tail drop algorithm. As this occurs simultaneously for all TCP connections of a system, the TCP flow control controls all connections, however, to reduce the data throughput.

This undesirable behavior in the network can be avoided if other algorithms are used for overload control, such as Random Early Detection, in which data packets are rejected not only when completely filled input buffers, but also when partially filled, the probability of Paketverwurfes with the level of the buffer increases.