A practical scheduling algorithm to achieve 100% throughput in input-queued switches

Input queueing is becoming increasingly used for high-bandwidth switches and routers. In previous work, it was proved that it is possible to achieve 100% throughput for input-queued switches using a combination of virtual output queueing and a scheduling algorithm called LQF However, this is only a...

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Published inAnnual Joint Conference of the IEEE Computer and Communications Societies Vol. 2; pp. 792 - 799 vol.2
Main Authors Mekkittikul, A., McKeown, N.
Format Conference Proceeding Journal Article
LanguageEnglish
Published IEEE 1998
Subjects
Aggregates
Bandwidth
Control systems
Fabrics
Hardware
Packet switching
Reflection
Scheduling algorithm
Switches
Throughput
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Summary:Input queueing is becoming increasingly used for high-bandwidth switches and routers. In previous work, it was proved that it is possible to achieve 100% throughput for input-queued switches using a combination of virtual output queueing and a scheduling algorithm called LQF However, this is only a theoretical result: LQF is too complex to implement in hardware. We introduce a new algorithm called longest port first (LPF), which is designed to overcome the complexity problems of LQF, and can be implemented in hardware at high speed. By giving preferential service based on queue lengths, we prove that LPF can achieve 100% throughput.
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ISBN:0780343832
9780780343832
ISSN:0743-166X
2641-9874
DOI:10.1109/INFCOM.1998.665102