The authors discuss and evaluate "Optimized Link State Routing Protocol" OLSR routing measurement performance analysis based on different simulation parameters. They have used NS-2 simulator tools for the performance of OLSR routing protocol simulation, they develop the simulation environment of small network (5, 10,15,25,30 Nodes) and observed the complexity of the mobile ad hoc network. The various performance parameters like average end-to-end delay, packets sent and received, throughput, consumed bandwidth has been analyzed. The paper describes all the simulator parameters taken and then compares the effect of complexity of simulation environment in performance of OLSR routing protocol. Their goal is to carry out a systematic comparative measurement study Optimized Link State Routing (OLSR) protocol in consideration of QoS parameters based on different simulation parameters.