Curbing of TCP Incast in Data Center Networks

Data centre networks widely uses TCP for communication between the servers as it provides reliability and congestion control. However, TCP does not work well for certain type of communication patterns. One such a pattern is barrier synchronized many to one communication. During this type of data transmissions, multiple servers simultaneously transmits data to a single client and also the client cannot issues its next request until it receives all the data from current transmission. This will leads to severe throughput collapse in the networks which is called as TCP Incast. The major causes of TCP Incast are the basic TCP which is used as a transport protocol and the congestion that happens at switch. In this paper, we use TCP Lite as transport protocol instead of basic TCP and also an active queue management scheme called Random early detection Input/Output with Coupled average queue (RIO-C) is incorporated to the incast scenario. This controls the congestion that occurs due to barrier synchronized transmission. The performance analysis of RIO-C mechanism is done on the basis of metrics such as bytes received, throughput, packet loss and number of retransmissions.