Response time guarantees for ATM-networked control systems
Hansson, H.
Sjodin, M.
Dept. of Comput. Syst., Uppsala Univ.;
This paper appears in: Factory Communication Systems, 1997. Proceedings. 1997 IEEE International Workshop on
Publication Date: 1-3 Oct 1997
On page(s): 213-222
Meeting Date: 10/01/1997 - 10/03/1997
Location: Barcelona, Spain
ISBN: 0-7803-4182-1
References Cited: 24
INSPEC Accession Number: 5767778
Digital Object Identifier: 10.1109/WFCS.1997.634301
Posted online: 2002-08-06 21:09:13.0
Abstract
We present the Response-Time Analysis (RTA) method for providing
real time guarantees in asynchronous transfer mode (ATM) communication
networks, and evaluates its suitability for use in hard real time
factory type environments. RTA provides an analysis of the network
traffic which can be used by an admission control mechanism to determine
if the timing requirements of a new connection can be guaranteed without
violating the requirements of already admitted connections. This type of
admission control is required by several multimedia and almost all real
time control applications. RTA is based on traditional fixed
priority/rate monotonic real time CPU schedulability analysis. This
makes it possible to combine communication analysis with CPU
schedulability analysis, thus allowing system designers to use the same
technique for assessing the timely behaviour of the entire system,
including both CPU and network scheduling. The only assumption RTA makes
about the ATM network is that the switches should be equipped with
prioritised output queues, something which is true for many commercial
switches. The main focus of the paper is on evaluating RTA. In the
evaluation we compare RTA with Weighted Fair Queueing (WFQ) and the
Calculus of Network Delays (CND). WFQ is the currently most popular
method for providing performance guarantees, and CND provides an
alternative analysis for prioritised queueing. The comparison shows that
RTA outperforms both WFQ and CND for a set of realistic traffic
scenarios
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