The dual round robin matching switch with exhaustive service

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Virtual output queuing is widely used by fixed-length high-speed switches to overcome head-of-line blocking. This is done by means of matching algorithms. Maximum matching algorithms have good performance, but their implementation complexity is quite high. Maximal matching algorithms need speedup to guarantee good performance. Iterative algorithms (such as PIM and iSLIP) use multiple iterations to converge on a maximal match. The dual round-robin matching (DRRM) scheme has performance similar to iSLIP and lower implementation complexity. The objective of matching algorithms is to reduce the matching overhead for each time slot. In this paper we present the exhaustive service dual round-robin matching (EDRRM) algorithm, which amortizes the cost of a match over multiple time slots. While EDRRM suffers from a throughput below 100% for small switch sizes, it is conjectured to achieve an asymptotic 100% throughput under uniform traffic. Simulations show that it achieves high throughput under nonuniform traffic. Its delay performance is not sensitive to traffic burstiness, switch size and packet length. In an EDRRM switch cells belonging to the same packet are transferred to the output continuously, which leads to good packet delay performance and simplifies the implementation of packet reassembly.

Original languageEnglish (US)
Title of host publicationHPSR 2002 - Workshop on High Performance Switching and Routing
Subtitle of host publicationMerging Optical and IP Technologies, Proceedings
PublisherIEEE Computer Society
Number of pages6
ISBN (Print)488552184X, 9784885521843
StatePublished - 2002
Event2002 Workshop on High Performance Switching and Routing: Merging Optical and IP Technologies, HPSR 2002 - Kobe, Japan
Duration: May 26 2002May 29 2002

Publication series

NameIEEE International Conference on High Performance Switching and Routing, HPSR
ISSN (Print)2325-5595
ISSN (Electronic)2325-5609


Other2002 Workshop on High Performance Switching and Routing: Merging Optical and IP Technologies, HPSR 2002


  • Dual Round Robin
  • Virtual Output Queueing
  • polling
  • scheduling
  • switching

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering


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