TAILIEUCHUNG - Factory Automation Part 7

Tham khảo tài liệu 'factory automation part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 232 Factory Automation The main difference between TCP and UDP could be that in TCP the packet size is variable and the workload is shaped to an average bandwidth utilization and a maximum burst size. However TCP breaks these packets into fixed size IP packets fragmentation so in the end the situation is not much different from UDP with fixed size packets. Evaluation scenarios Another purpose of the experiments is to show the effectiveness of each of the two traffic control mechanisms the managed switch and the Linux TC mechanisms. For this reason several scenarios have been properly configured. They are shown in Fig. 6. To evaluate the effect of Linux TC the real-time traffic is sent between nodes blade and bladed and the background workload is sent from blade to blade3. In this scenario the realtime messages go through the following queues1 see Fig. 6 Contention at TC TC2 SP4 TC4 SP2. Messages from blade to bladed contend with the background traffic at TC2 while the messages returning from bladed to blade meet the ACKs generated by the background traffic in SP2. According to this only TC affects the jitter of the messages arriving at bladed while both TC and the switch affect the round-trip delay. However the effect of ACKs is negligible. Thus this scenario mostly measures the effectiveness of Linux TC. Fig. 6. Evaluation scenarios. To evaluate the effect of the switch the background workload is sent from bladed to blade see Fig. 6 Contention at the switch . Now the real-time messages blade bladed contend with the background traffic in SP2 so this scenario measures the effectiveness of the switch. TCn stands for the queues of the outbound network interface of node n while SPn stands for the queues of the switch port of node n. Analysis of switched Ethernet for real-time transmission 233 Finally in a scenario where a background workload is sent from blade to blade3 and another background workload is sent from blade3 to blade see Fig. 6 Contention both at TC .

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