基于最小接入保证带宽的数据中心网络带宽分配机制

Minimum access guaranteed bandwidth allocation mechanism in data center network

针对云计算数据中心(DC)网络中多租户间易相互干扰导致应用性能不可预测,预留带宽资源难以保证高网络利用率,从而导致云网络供应商收益损失等问题,提出了基于最小接入保证带宽的数据中心网络带宽分配(MAGBA)机制。MAGBA机制在发送端通过加权公平队列调度租户虚拟机(VM)流量,在接收端基于检测到的接收速率调节TCP流接收窗口,从而为租户VM提供最小接入保证带宽,同时充分利用闲置带宽资源。通过NS2平台仿真,MAGBA机制相比静态资源预留方式能够灵活分配带宽资源,网络吞吐量提升25%。当某些租户产生大量TCP流时,MAGBA机制中其他租户分得的带宽高于现有基于TCP流的带宽分配机制。仿真结果表明,MAGBA机制能够为租户VM提供最小接入带宽保证,避免租户应用受到其他租户通信模式的干扰。

In Data Center Network （DCN）, multiple tenants may interfere with each other, which leads to unpredictable application performance. Reserving bandwidth resources can hardly guarantee high network utilization, which may result in revenue loss of cloud providers. To address above problems, a Minimum Access Guaranteed Bandwidth Allocation （MAGBA） mechanism for data center networks was proposed. To provide the minimum bandwidth guarantee and make full use of idle bandwidth for tenants, the MAGBA scheduled traffic of Virtual Machine （VM） through Weighted Fairness Queuing at the sending side, and it adjusted TCP flow＇s receiving window at the receiving side. Through simulations on NS2 （ Network Simulation version 2） platform, compared with the static resource reservation method, MAGBA mechanism was more flexible in bandwidth allocation and it could improve the network throughput by 25%. When some tenants sent a lot of TCP flows, the other tenants in the MAGBA obtained higher bandwidth than that in the existing bandwidth allocation mechanism based on TCP flows. The simulation results show that the MAGBA mechanism can provide minimum access guaranteed bandwidth for VMs and it can avoid interferences from other tenants.