An important study on preventing congestion in data centers using cloud computing platforms is presented in this paper. The authors propose a new framework prototype, XCo, that helps in the prevention of network congestion. More than just an explanation of the framework, this paper is an interesting source for people who want to learn about virtualization and how this technology can help prevent congestion.

All of the details of this framework and the algorithm used to implement the congestion control are presented. The evaluation and tests show that it is a good option, and prove the advantages of virtualization in preventing network congestion. An actual testbed and a simulation (using NS3 in this case) are compared; the similarity of the results validates the ideas and the tool proposed. The examples presented in the paper are very intuitive and easy to understand.

The authors provide good background information, including some assumptions, limitations, and problems with this kind of technology. There is also a good literature review. The final section describes open problems.

Overall, this is a useful and complete reference on Ethernet platforms and congestion control. Those interested in understanding more about data centers and their problems should read this paper.