In datacenter networks, not all the devices are explicit congestion notification (ECN) enabled, especially for legacy devices of tenants. Thus the unfairness between ECN and nonECN flows is inevitable. Virtual congestion control (vCC) solves ECN unfairness by throttling the receiving window of TCP header. We analyze the performance of vCC with consideration of the bandwidth characteristics of tenants in datacenter networks. We design simulation scenarios according to the number of tenant hosts, bandwidth requirement, congestion level of networks, and congestion control algorithms for highspeed networks. Simulation results show that:1) the performance of vCC is good and not affected by the number of tenant hosts, the difference of tenant bandwidth, and the congestion level of networks; 2) the performance of vCC is different under different congestion control algorithms. The ECN unfairness is not well improved by vCC when using YeAHTCP.