Xen and the art of virtualization
SOSP '03 Proceedings of the nineteenth ACM symposium on Operating systems principles
To infinity and beyond: time-warped network emulation
NSDI'06 Proceedings of the 3rd conference on Networked Systems Design & Implementation - Volume 3
Time Jails: A Hybrid Approach to Scalable Network Emulation
Proceedings of the 22nd Workshop on Principles of Advanced and Distributed Simulation
DieCast: testing distributed systems with an accurate scale model
NSDI'08 Proceedings of the 5th USENIX Symposium on Networked Systems Design and Implementation
Bridging the gap between software and hardware techniques for I/O virtualization
ATC'08 USENIX 2008 Annual Technical Conference on Annual Technical Conference
SliceTime: a platform for scalable and accurate network emulation
Proceedings of the 8th USENIX conference on Networked systems design and implementation
A Virtual Time System for OpenVZ-Based Network Emulations
PADS '11 Proceedings of the 2011 IEEE Workshop on Principles of Advanced and Distributed Simulation
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In this paper, we discuss a time synchronization approach to the time divergence problem in hybrid network emulation. Such emulation comprises primarily a discrete-event simulated network and virtual machines that send and receive traffic through the simulated network. For slower than real-time network simulations, the rate of time advance on virtual machines (real time) is faster than that of the discrete-event time. Consequently, packet transmission latency and other metrics in such hybrid network emulations will be distorted. As a result, e.g., TCP sessions between virtual machines may unduly time out. To address this problem, we have developed TimeSync, which tracks discrete-event simulation time to control time advance on virtual machines for slower than real time simulations so that time perception in the hybrid network emulation system is synchronized. We describe how TimeSync works and present our experimental evaluation and analysis.