Major cloud computing providers agree on denoting the flow completion time (FCT) as the primary goal to achieve in the design of a data center network (DCN). This is motivated by the fact that latency affects the performance of most cloud computer applications, such as web search, video streaming and social networking, with a direct impact on quality of experience as perceived by end users, hence ultimately on revenues. Many existing approaches in literature rely on prioritization mechanisms at flow or packet level and schedulers in the network to reduce the average FCT, albeit for some applications also tail latency is important.