Improving TCP congestion control in datacenters

Abstract

These day interactive and social media applications demand huge computa- tion and storage capacity. To cope with the issue, technology giants such as Google and many others have deployed large number of datacenters. In- side these datacenters, where queries are highly time sensitive, about 80% of the tra c is East-West (remaining within the datacenter). TCP restricts the performance of the datacenter due to its various parameters designed for wide area networks. In this regard, research community proposed many modi cation to TCP that could improve its performance in datacenter en- vironment. Google has recently proposed increase in TCP's Initial window (IW) to 10MSS. In this work, we would be investigating performance of TCP with IW=10 in datacenter environment. In this simulation-based study, we would evaluate the performance issues related to IW=10 proposition if imple- mented in datacenter environment. We propose SDN controller based appli- cation to mitigate the incast issue with the usage of IW-10. This application uses network to avoid incast issue and does not require any modi cation on end hosts.