Round Trip Time Fairness for High Bandwidth TCP
Date and time: 11.30am-12.30pm, Friday 2nd September, 2005
Venue: 10.08.04
Chair: Xiaodong Li
Abstract:
Using TCP on High bandwidth paths with
significant round trip times (RTT) has highlighted the intrinsic problems TCP
faces when required to scale to very large congestion window sizes, while
maintaining acceptable throughput and utilisation. HighSpeed
TCP is a protocol that was designed to scale
up TCP so that peak sending rates of 10Gbps can
be achieved at realistic loss rates. However, it is known that TCP
congestion control operating with a low RTT will gain a higher bandwidth share
than TCP operating with a high RTT. We
investigate and show that HighSpeed TCP
has, at best, the same bias towards low RTT connections, with a potential for
much greater unfairness to high RTT connections. We then propose a
normalisation scheme so that HighSpeed TCP
connections with disproportionate RTT can gain fair bandwidth share. We show
through modelling and simulation that our scheme is capable of meeting RTT
fairness for high bandwidth TCP.
About the speaker:
Damien Phillips is in the final year of his PhD in the School
of Computer Science and Information
Technology. Damien has previously completed a Bachelor of Applied Science
(Computer Science)/Bachelor of Engineering (Computer Systems Engineering)
double degree here at RMIT.
Seminar Organisation
Seminars are free and open to the general public. No booking is necessary.
If you are interested in giving a presentation in this seminar series, or to
make suggestions for speakers, please contact Xiaodong Li, the seminar
co-ordinator.