Implementing fair queueing in ATM switches: the discrete-rate approach
The total implementation cost of schedulers which approximate the generalized processor sharing (GPS) policy is dominated by the complexity of maintaining and sorting the time-stamps for all connections. Several approaches have been proposed which reduce the cost of the sorting operation and only in...
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Published in | Annual Joint Conference of the IEEE Computer and Communications Societies Vol. 1; pp. 272 - 281 vol.1 |
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Main Authors | , |
Format | Conference Proceeding Journal Article |
Language | English |
Published |
IEEE
1998
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Subjects | |
Online Access | Get full text |
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Summary: | The total implementation cost of schedulers which approximate the generalized processor sharing (GPS) policy is dominated by the complexity of maintaining and sorting the time-stamps for all connections. Several approaches have been proposed which reduce the cost of the sorting operation and only introduce a small degradation in the delay bounds of the scheduler; they include logarithmic calendar queues and schedulers supporting a discrete set of guaranteed rates. All these techniques still require computing and storing one time-stamp per connection, thus maintaining the cost of GPS-related algorithms clearly higher than that of less sophisticated schedulers. Furthermore, in the case of the discrete-rate approach, the complexity increases linearly with the number of supported rates, thus making it attractive only for relatively small numbers of rates. In this paper, we introduce a discrete-rate GPS-related scheduler which does not require the computation and storage of one time-stamp per connection, and only maintains a single time-stamp per rate. The elimination of the per-connection time-stamps has no negative effect on the delay bounds. Then, we present a generalized discrete-rate approach, which uses a given number of FIFO queues to support a larger number of guaranteed rates, and only introduces a modest degradation in delay bounds for certain rates. The technique can be applied to our no-per-connection-time-stamp scheduler, as well as to any discrete-rate scheduler. |
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Bibliography: | SourceType-Scholarly Journals-2 ObjectType-Feature-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Article-3 |
ISBN: | 0780343832 9780780343832 |
ISSN: | 0743-166X 2641-9874 |
DOI: | 10.1109/INFCOM.1998.659663 |