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VIPE

A Virtual Platform for Network Experimentation

Olaf Landsiedel, Georg Kunz, Stefan Götz, Klaus Wehrle

Barcelona / SIGCOMM VISA, August 2009

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Motivation

Network Simulation Testbed Deployment Design Concept ns-2 PlanetLab Linux Re Re-Implement Re Re-Implement Implement Varie riety of Evaluatio ion T Tools ls

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Motivation

PlanetLab Linux Network Simulation Testbed Deployment Design Concept NS-2 OMNeT++ Network Cradle Tossim EmuLab FlexLab Linux Windows Windows Mobile TinyOS RTOS Embedded Linux Model- Net Mesh Testbed WSN Testbed EmStar Var ariet ety o

• f Tar

arget Sy Syste tems Varie riety of Evaluatio ion T Tools ls Re Re-Implement

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Concept  Challenge

 Completeness vs. complexity of abstraction

Seamless Transition

Prot

• toc
• col
• l

Testbed OS Kernel Simulator

 Our goal: Lightweight abstraction

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Protocol Design

Network Application Operating System / Simulator

Memory Time Packet Sync. Higher Layer Interface Lower Layer Interface

• start()
• stop
• modify()
• pause()
• …
• create()
• clone()
• expand()
• delete()
• …
• send()
• receive()
• …
• malloc()
• free()
• memcpy()
• memcmp()
• …
• lock()
• unlock()
• …
• Event based
• Language independent
• POSIX-like API
• send()
• receive()
• …

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Protocol Integration  Flexible Placement

 Layer independent  Utilize existing protocols / simulation model

Memory Time Packet Sync. Higher Layer Interface Lower Layer Interface Protocol HTTP FTP RTP TCP UDP IPv4 IPX IPv6 Ethernet 802.11 PPP

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Chord

Use Cases

OS Network Interface Native Socket Interface

Userspace Kernel Application Application

RTP IP

Application

SCTP Native Stack

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Runtime Overhead  Benchmarks of Virtual Resources

 CPU time-stamp counter

Win Windows XP XP Linux 2. 2.6. 6.22 22 Kernel Userspace Kernel Userspace Memory Synchronization Timer Device send() Device receive() Packet create() Packet delete() 14.5% 11.5% 34.2% 9.7%

0%

macros and function inlining

≤ 0.2%

utilize platform specific data structures

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Implementation Complexity  Implementation Complexity

 Lines of Codes

200 400 600 800 1000 1200 1400 1600 1800

ns ns-2

Window dows X XP Window dows C CE

Userspace Kernel

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Runtime Performance  Macro-Benchmark

 Routing performance  Based on VIPE IPv4 implementation

300 400 500 600 700 800 900 1000 64 256 1024

Throughput [Mbit/s]

Packet Size [bytes] ProFab Linux VI VIPE PE Li Linux nux

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Conclusion  VIPE: Virtual Platform for Network Experimentation

 Unified programming environment  Seamless transition between platforms

 Lightweight Architecture

 Based on best practices in systems design  Tight feedback loop  Evolve NOT re-implement protocols  Small porting effort  Low performance overhead

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Georg Kunz: VIPE – A Virtual Platform for Network Experimentation

Thank you for your attention.