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Calculation of Worst Case Backlog for AFDX Buffers with Two Priority Levels using Trajectory Approach


Category: Inproceedings
Author(s)Gerhard Fohler, Rodrigo Coelho, Gerhard Fohler
Source12th Workshop on Real-time Networks (RTN’13) in conjuction with 25th Euromicro International Conference on Real-time Systems (ECRTS’13).
Date Jul 2013

Abstract

AFDX (Avionics Full Duplex Switched Ethernet) is a network standard chosen to replace point to point connections in avionics systems. AFDX guarantees bandwidth reservation by means of virtual links, which can, according to the standard (ARINC 664 Part-7) be classified with two priority levels: high and low. AFDX switches must have buffers at their output ports and in order to not incur in data loss, buffer overflow must be avoided. AFDX standard determines the minimum amount of buffer dedicated to an output port, however it is up to the designer to select the actual buffer size and how to allocate it for the two priority levels of virtual links. Previous works make use of trajectory approach (TA) to analyze AFDX networks and compute the worst case backlog of output buffers for single priority flows. A method to compute the worst case backlog for two priorities buffers is the issue addressed in this paper. We make use of the trajectory approach to determine the frames competing for the output port. Further, we analyze the worst case scheduling scenario of frames competing for output ports and show how the arrival of frames in the input links impacts the computation of the backlog for two priority level buffers.

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