InfiniBand is becoming a leading interconnect technology used in many of world’s most powerful supercomputers. To guarantee the high-bandwidth and low-latency requirements of HPCs and modern data centers, the Infini- Band architecture supports a congestion control mechanism which speci- fies a set of parameters. The effectiveness of the mechanism largely de- pends on these parameter values. InfiniBand is flexible to support several types of topologies which allow simultaneous connections across multiple links. Mesh topology has been one of the most popular interconnection network used in InfiniBand to maintain the bandwidth and latency perfor- mance requirements to the highest level. In this thesis, we studied the effect of the InfiniBand congestion control (IB CC) on the performance of mesh networks and explore a selected set of IB CC parameter values to realize their impact on the behaviour of the mechanism and evaluate the performance gains on this topology. With several number of simulations using CC capable IB model in the OMNeT++ platform, encouraging results that verify the effects of the parameter values and the efficiency of the IB CC mechanism were obtained. The result analysis justified that the negative effects of congestion such as HOL blocking and parking lot problem were successfully avoided by the mechanism and the parameter values Marking_Rate=1 and CCTI_Timer=250 improved the network performance by 51.6%.