On the combined effect of self-similarity and flow control in quality of service for transactional Internet services.

摘要

In this paper we show that the combined effect of heavy-tailedness and flow control leads to considerable transaction delays. Neither heavy-tailedness nor flow control separately imply a significant degradation in quality of service. We consider transactional Internet services such as WWW and relate user perceived quality of service to total transaction delay instead of packet or cell instantaneous delay [2]. We evaluate transaction delay by simulation of an IP over ATM link in whick a large number of users are multiplexed and we compare to M/G/1 analysis. Our traffic model assumes heavy-tailed features in file sizes and a constant rate for packet interarriveal times within transactions. We show that an in increase in bandwidth assignment, i.e. a decrease in link utilization factor, does not translate into a significant performance improvement. However, an increase in window size proves more effective.