A Real-Time Packet Burst Metric TERENA Networking Conference 2004 Klaus Mochalski Computer Science Department University of Leipzig, Germany Jörg Micheel NLANR Measurement and Network Analysis Group San Diego Supercomputer Center University of California San Diego, USA
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A Real-Time Packet Burst Metric TERENA Networking Conference 2004 Klaus Mochalski Computer Science Department University of Leipzig, Germany Jörg Micheel.
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A Real-Time Packet Burst Metric
TERENA Networking Conference 2004
Klaus MochalskiComputer Science DepartmentUniversity of Leipzig, GermanyJörg MicheelNLANR Measurement and Network Analysis GroupSan Diego Supercomputer CenterUniversity of California San Diego, USA
Objective and Motivation
QoS-aware measurement of network link utilization
• on a small time scale
• with respect to different traffic profiles (burstiness)
• to provide useful data to network operatorsfor troubleshooting and resource planning
• to provide a more meaningful alternative toaverage utilization values
Think of a network speedometer
Current Practice
coarse averages are collected and exported by routers
• meaning of averages depends on the interval being used
• common intervals on the order of minutes hide traffic characteristics
• packet level time scale: a link is either idle or busy
What to measure?
Proactive approach:How much bandwidth is available for additional traffic of a certain profile?
Reactive approach:What happens to my packets?
Delay, Jitter caused by long router queues which in turn are caused by and cause
packet bursts
If we know all about bursts, then we know all about the traffic and the router’s problems.