Performance of a DHT Ns2

Objectives

• Evaluate performance and scalability of the DHT implementation (Latency, Bandwith, Startup latency, Changes in the network structure) in Ns2 Simulator
• Comparation between DHT and traditional approaches (Flooding)
  • Difference in fulfilling a request
  • Difference in startup and structural change latency
• Comparation between simulation and experimental results

Measurement Plan

Influence Factors

• Size of the (core BRN) network in number of nodes: 2, 4, 16, 64, 121
• Number of clients (per BRN node): 1, 4, 16
• Changes in the network structure: Schachbrett, Social Cluster
• Charater of requests?: alle Knoten holen sich IP ungefähr gleichzeitig (jittering), hintereinander

Measurement Values

• Response time of an request (DHCP, ARP)
• Error-Rate: Antworten/Anzahl Anfragen (Wichtig: DHCP only test, ARP mit vorherigen kontrollierten DHCP-Config), ARP verschiedene Timeouts
• Used bandwidth for fulfilling a request (number of packets or bytes?): global, per Client

Constants during Measurement

• Only 1 request at a time (jittering)

Measurement: Latency

• Variable number of nodes n
• Only on client
• Measure time for fulfilling a request for DHT and Flooding
• Outcome: Diagram "Response Time against Number of Nodes"

Measurement: Startup Latency

* 30 Seconds for BRN (Routing,...)
* up to 10 Seconds for DHT ( 4 sec for 64 Nodes, 8 for 121 Nodes )
* Timing:
*** 0 BRN
*** 30 DHT
*** 40 DHCP
*** 60 ARP ( DTH/Flooding) Time is test now

Measurement: Dynamic Changes in the Structure of the Network

• Measure time for reorganization