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To predict lower bounds on the performance of applications, the cloud should provide guarantees on bandwidth that each virtual machine can obtain. By competing for spare network bandwidth, current solutions that provide bandwidth guarantees can achieve work conservation as well. However, they usually fail to provide accurate bandwidth guarantees, for the interference between traffic for achieving the two objectives respectively. In order to eliminate the interference, they reserve sufficient bandwidth headroom for every link, which cannot be allocated to tenants as guarantees, incurring a decrease in the total of guarantees that each link can offer and thus a decline in the revenue of the cloud provider. To address the problem, this paper proposes a new mechanism, namely DFlow, which achieves bandwidth guarantees and work conservation simultaneously. Specifically, DFlow isolates its solutions for achieving …