Comparison of TCP Reno and TCP Vegas via Fluid Approximation
نویسنده
چکیده
We compare the efficiency of the flow control of two versions of TCP, the transmission control protocol of the Internet: the current version called Reno, and a recently proposed version called Vegas. By means of a fluid approximation, we show that due to the use of round-trip times measurement, the window dynamics of TCP Vegas are much more stable than those of TCP Reno, resulting in a much more efficient utilization of the network resources. In addition, whereas TCP Reno discriminates against users with long propagation delays, TCP Vegas fairly shares the available bandwidth between the users, whatever their propagation delays. Key-words: Internet, TCP, window flow control, fluid approximation, stability, performance evaluation, fairness. France Télécom CNET and INRIA Email: [email protected] Comparaison de TCP Reno et TCP Vegas par Approximation Fluide Résumé : Nous comparons l’efficacité du contrôle de flux de deux versions de TCP, le protocole de contrôle de transmission de l’Internet : la version actuelle appelée Reno, et une version récemment proposée appelée Vegas. Par une approximation fluide, nous montrons que grâce à l’utilisation des mesures de temps de transmission des paquets, la dynamique de la fenêtre de TCP Vegas est beaucoup plus stable que celle de TCP Reno, et conduit à une utilisation bien plus efficace des ressources du réseau. De plus, alors que TCP Reno défavorise les utilisateurs ayant de long délais de propagation, TCP Vegas partage la bande passante équitablement entre les utilisateurs, quelque soient leurs délais de propagation. Mots-clés : Internet, TCP, contrôle de flux à fenêtre, approximation fluide, stabilité, évaluation de performance, équité. Comparison of TCP Reno and TCP Vegas via Fluid Approximation 3
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