I study IP SLA because i want to test my network for VoIP. I found an article who show a study of " Scalability of Layer 3 Tunneling Protocols: Case of Voice Traffic Over IP". "Based on this project we created 96 different scenarios. For each technology (IP, GRE, IPsec, GRE over IPsec, DMVPN, DMVPN IPsec) we have increased the packet load to the order of 2 ^ n ranging from 64 to 375000." What is this "packet load" paramiter in IP SLA?