Implementing OSI Protocol Stack in a Multiprocessor Environment

Sunwan CHOI  Kilnam CHON  

IEICE TRANSACTIONS on Communications   Vol.E79-B   No.1   pp.28-36
Publication Date: 1996/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Signaling System and Communication Protocol
OSI,  parallel protocol implementation,  

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Parallel processing is a well-known approach to enhance the performance of communication subsystems. The several forms of parallelism embedded in communication protocols have been applied to the OSI protocol stack. However, the OSI protocol stack involves sequential processing due to the layered architecture. Thus, all the layers have been prevented from performing immediate processing as soon as the data arrives. To solve the problem, we apply a Multiple Instruction Single Data (MISD) parallel scheme to OSI processing for the network layer through the presentation layer. In the MISD scheme, different processors can be allocated to different layers and concurrently run the code for each layer. In contrast, the conventional approach adopts for a pipeline scheme that all the layers can be assigned to different pipeline stages and will be performed in a time interval and their dependence. The implementations have been performed to compare the pipeline scheme with the MISD scheme on the Parsytec Super Cluster consisting of 64 Transputers. The measures show that the MISD scheme has performance improvement as high as about 84% in comparison with the pipeline one.