| Traditional Internet is facing challenges in terms of service quality,management and control ability,security,and scalability,so a variety of evolutionary or innovative new architectures are proposed.To solve the problem of transition and integration of various new architectures,the Smart Integration Identifier Network proposed realizes the collaborative scheduling of adaptive service requirements through the intelligent integration of heterogeneous resources in the network.At the Network Component Layer,the multi-path transmission of data packets is realized by using multiple interfaces and multiple protocol stacks.A multi-path and cross-protocol transmission system model is built to achieve bandwidth aggregation,to improve the network resource utilization and transmission efficiency of the system.However,due to the inherent differences and dynamic changes in the performance of different paths,it is very easy for packets to be out of order in the process of transmission,resulting in the blocking of the buffer at the receiver and the reduction of throughput,which makes it difficult to achieve the goal of efficient transmission.Based on the National Key Research and Development Program of China "Research and Verification of Smart Integrated New Routing Switching Equipment"(2018YFE0206800),this dissertation proposes a lightweight packet DelayProgrammable Scheduler(DPS)mechanism to effectively mitigate the problem of packet out-of-order in the multi-path and cross-protocol system under the Smart Integration Identifier Network.Specifically,using the virtual network device,a virtual network loop is built at the edge switching device near the receiver to transmit the scheduled packets.Then,based on the real-time performance of the link or the network state information carried by the packets,the packet forwarding strategy is dynamically formulated to forward the scheduled packets to the loop or the receiver.Finally,the number of packets transmitted in the virtual loop is adaptively controlled with a certain weighting algorithm to achieve the best reduction of out-of-order and transmission performance improvement.The main work of this dissertation is as follows:Firstly,this dissertation analyzes the research status of multi-path parallel transmission based on different protocol levels at home and abroad.We discuss the development status and main trends of the data transmission scheduling mechanism.We also expound on the research objectives and significance of this dissertation.Then,the key technologies involved in the scheme are introduced,and the key problems and difficulties of multi-path and multi-protocol transmission under the Smart Integration Identifier Network are deeply analyzed,and the characteristics of the transmission scheme are further explored.Then,this dissertation proposes the DPS mechanism of multi-path and multiprotocol transmission scheduling based on out-of-order optimization.DPS mechanism is based on the Programming Protocol-independent Packet Processors(P4)language,compatible with a variety of network protocols,expanding the network boundary.It improves the flexibility of packet forwarding through fine-grained real-time packet scheduling.DPS makes efficient use of the advantages of proximity to the receiver and virtual network devices.So it improves the compatibility with other scheduling mechanisms.Based on the forwarding algorithm,the self-adaptive weighting algorithm is used to optimize the parameters,which improves the universality of various new architectures and heterogeneous network scenarios.This dissertation focuses on the DPS scheme based on link performance and connection state respectively and introduces the implementation principle of the scheme and the core design idea of each submodule in detail.Then,the implementation methods and technical details of the two schemes are explained.At the same time,combined with the data processing and information interaction process between each module,the overall function and goal of the scheme are described.Finally,in order to analyze and verify the feasibility and effectiveness of the multipath and cross-protocol transmission scheme,the DPS scheme is tested and analyzed.The experimental results indicate that the DPS scheme can reduce the percentage of out of order packets by more than 50% and improve the average throughput by 1-3 times in different heterogeneous network scenarios,and can effectively improve the effect of bandwidth aggregation and load balancing in actual network communication scenarios.Through parallel implementation with other scheduling strategies,the transmission performance can be improved efficiently.Therefore,the scheme proposed in this dissertation will provide important practical significance for the performance optimization of new network architecture and the research and design of packet scheduling strategy in data centers. |
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