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Abstract : |
As a case study, we present the results of performance and traffic behavior analyses of the Xphone system. Our major findings are: 1) Effects of the total network load on the performance of Xphone are generally significant. The video frame rate is adversely affected by the high variability of the concurrent network activities. Audio/video frames occasionally experience delays of more than 1--2 seconds. However, average end-to-end delay is relatively small despite high concurrent network load. Video frame drops due to audio/video synchronization appear to occur independently of the concurrent network activities. 2) Our analysis indicates that TCP appears to be inefficient for this application under the current implementation. 3) The packet size distribution of the system is strictly bimodal. 4) The traffic generated by the system shows fractal behavior, with the same fractal dimension regardless of the concurrent network activities., |
