Performance of HTTP Application in Mobile Ad Hoc Networks Asifuddin Mohammad.

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Presentation transcript:

Performance of HTTP Application in Mobile Ad Hoc Networks Asifuddin Mohammad

Performance of HTTP Application in Mobile Ad Hoc Networks Introduction Related work Paper 1 Paper 2

Introduction Objective Understanding the effect of factors like mobility, congestion etc., on HTTP response time in Mobile Ad hoc Networks(MANETs)‏

Introduction Preview Characterize the resilience of Client-Server application in MANETs using Abdul's State- Space framework

Introduction Major issues with TCP in wireless environment  Mobility  Congestion Many changes Proposed

Related work Paper 1  Performance benchmarking of wireless Web servers Paper 2  On Routing Web and Multimedia Traffic in Mobile Ad Hoc Networks

Paper 1 Does an experimental analysis of HTTP transaction Focus on HTTP transaction rate and end to end throughput achievable in Ad hoc networks Studies the impact of factors such as Web object size, number of clients, and persistent HTTP connections

Paper 1 Portable short-lived network  wireless classroom  Sporting events  Disaster recovery Focus on wireless web servers

Paper 1 Web protocols: IP, TCP and HTTP IP  Connectionless network layer  Provides global addressing and routing TCP  Connection-oriented transport layer  Provides end to end data delivery HTTP  Request-response application layer  Transfer web documents between web servers and web clients

Paper 1

Each Notebook is running RedHat Linux OS Cisco Aironet 350 Series Adapter configured to operate in ad-hoc mode DCF,11Mbps,MTU= 1500 bytes

Paper 1 This paper doesn't consider node mobility, multiphop and ad hoc routing issues Httperf  Used to generate client request  Web workload generation tool developed at HP laboratories for web performance measurements Apache webserver  HTTP complaint  70% deployed Network Analyzer  SnifferPro 4.6  Provides real time capture of all the observed traffic

Paper 1 Experiment 1: Request rate Experiment 2: Multiple Clients Experiment 3: Persistent HTTP connections Experiment 4: Transfer Size

Paper 1 Experiment 1: Request rate  Single client, sever and Sniffer Laptops  Web object size is 1KB  10 request per second  Non-persistent connections  Each HTTP 1.0 transaction generates 10 TCP packets

Paper 1

Experiment 2: Multiple Clients  Two or more Clients  More than 30% throughput then single client Fairness Problem in Wireless network  Load Imbalance  Heterogeneous transmission rates  Difference in wireless channel quality  Contention patterns in the wireless channel access  Packet losses at a point of congestion shared by upstream and downstream flows Relative phasing between clients causes fairness issues

Paper 1

Experiment 3: Persistent HTTP connections  TCP connection rate is 10 request per second  Transfer size is 1KB  Persistent HTTP Results  350% increase

Paper 1

Experiment 4: Transfer Size Single Client,10 request per sec Varying Transfer size of 8KB,32KB,48KB,64KB

Paper 1

Conclusion  Wireless web servers can provide 1KB of HTTP transaction rates of 110 connection for non- persistent connection and 320 connections for persistent  Bottleneck at server and client interface  Unfairness  Network trashing  Persistent HTTP solution for some extent