Traffic Statistics

The investigation of network traffic using statistical analysis to gain insight into performance and behaviour.

Paper review
Towards predictable datacenter networks
Authors: 
Hitesh Ballani, Paolo Costa, Thomas Karagiannis and Ant Rowstron
Published: 
SIGCOMM

This paper looks at the issue of reducing variability in performance in data centre networks. Variable network performance can lead to unreliable application performance in networked applications – this can be a particular problem for cloud apps. Virtual networks are proposed as a solution to isolate the “tenant” performance from the physical network infrastructure. The system presented is known as Oktopus. The system provides a tradeoff between guarantees to tenants, costs to tenants and profits to providers by mapping a virtual network to the physical network.

Paper review
The RTT distribution of TCP flows on the Internet and its impact on TCP based flow control
Authors: 
Srinivas Shakkottai, R. Srikant, Nevil Brownlee, Andre Broido and kc claffy
Published: 
CAIDA technical report

This paper looks at RTT and how they affect TCP flows. Because of limited data they look at how to derive RTTs from analysis of tcpdump data (unidirectional).

Methods of getting estimates of RTT are:

  • SYNSYN-ACKACK – the time stamp between SYN and ACK in triple handshake.

  • Flight method – look at packets with near identical inter-packet times. Calculate time between start of flights (attempt to ignore rate-limited flows).

Conference paper
Networking 2011, Lecture Notes in Computer Science (6641)

This paper considers the problem of balancing traffic across network egresses. It achieves a workable solution using a scalable packet market scheme which couples end-hosts controlling their own connection with an overall controller which can select routes appropriately for each flow.

The flows are balanced to seek paths which minimise loss.

Workshop paper
Performance Modeling and Evaluation of Computer and Telecommunications (PMECT), ICCCN Workshop

This paper looks at the phenomenon of long-range dependence. It shows that certain long-range dependent models give answers which contain infinities and also that this behaviour will not be detected by a naive modelling approach. The work is extended in the JCCS paper

Talk
Location: 
Cosener's house Next Generation Networks meeting
Date: 
2013-07-10
Comments: 

Talk to Next Generation Networks meeting -- this talk is partly based on the ICC paper (fundamental relationships in TCP flows) and shows how TCP throughput arises from network parameters and engineering decisions.

Conference presentation
Location: 
IEEE International Conference on Communications, Budapest (ICC 2013)
Date: 
2013-06-12
Comments: 

This is a talk about TCP throughput and how it relates to network parameters such as delay, loss and flow length. The full paper is the ICC paper.

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