一种高效自适应的CICQ交换机数据包切分机制

A novel efficient adaptive packet segmentation scheme in CICQ switches

为了有效处理CICQ(Combined Input Crosspoint Queued)交换机中的变长数据包,通常采用切分-重组(Segmentation and Reassembly,SAR)机制将变长包切分为定长信元进行交换。针对目前已有切分方法在不同网络流量下交换效率低、灵活性差的问题,设计了一种基于CICQ交换机的高效自适应数据包切分机制。新机制的主要思想是根据输入端的队列状态实时改变切片大小,并采用相邻数据包合并切分的方式进行切片,以自适应网络环境中的不同流量和数据包长度。仿真结果表明,提出的数据包切分机制较传统切分方法有显著优势,与已有方法中表现最好的变长多包切分相比,在不同的流量下能获得更优的时延性能和系统稳定性。

In order to operate on variable- size packets in CICQ（ Combined Input Crosspoint Queued） switch effectively, segmentation and reassembly（ SAR） is generally used to segment packets into cells to be switched. Existing packet segmentation schemes have the disadvantage of low switching efficiency and poor flexibility in dynamic network traffic. In this paper, a novel efficient adaptive packet segmentation scheme for CICQ switch is proposed. The main idea is modifying the segment size flexibly according to the status of input queues, and performing packet segmentation based on cell- merging, to adapt different traffic flows and packet lengths in network environments. Simulation results show that the proposed packet segmentation scheme is can exhibit excellent delay performance and system stability superior to existing variable- size multipacket segments scheme under various traffic models.