Congestion Control in Bandwidth Measurement Tools A Comparative Analysis

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Congestion Control in Bandwidth Measurement Tools
A Comparative Analysis

• - Deepa S. Rao

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Overview

• Introduction
• Background
• Individual tests
• Comparison of tools
• Analysis
• Conclusion

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Introduction

• Bandwidth monitoring techniques
• Importance of bandwidth estimation
• Tools considered
• PathChirp
• TOPP
• Pathload
• Pathrate

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1. PathChirp 2. TOPP

• End to end bandwidth estimation tool that
  uses active probing to estimate avail-bw in a n/w
  path.
• Based on transmission of Chirps.

• Measures by probing and does an analysis based on
  segmented regression.
• Two Phases
• Active probing phase
• Analysis Phase.

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3. Pathload 4. Pathrate

• Uses Packet pairs with statistical techniques to
  estimate the capacity of a narrow link in a path.

• Uses UDP for periodic packet streams and TCP
  connection between two end points.

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PathChirp TOPP
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Pathload Pathrate
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Analysis

• PathChirp vs. TOPP
• Pathload vs. TOPP
• PathChirp vs. Pathload
• Pathrate vs. Others

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Conclusion and Remarks

• Very little work being done in this area even
  though lot of work being done in general in the
  measurement tools area.
• PathChirp the best among the tools I studied.
• Pathrate technique used not good enough for
  heavily congestion links.
• Pathrate 2.1.1 slightly better.
• TOPP in general functions well in multi-hop
  scenarios.