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Zusammenfassung:
Understanding the characteristics of the Internet delay space (i.e., the
all-pairs set of static round-trip propagation delays among edge networks in
the Internet) is important for the design of global-scale distributed systems.
For instance, algorithms used in overlay networks are often sensitive to
violations of the triangle inequality and to the growth properties within the
Internet delay space. Since designers of distributed systems often rely on
simulation and emulation to study design alternatives, they need a realistic
model of the
Internet delay space.
Our analysis shows that existing models do not adequately capture important
properties of the Internet delay space. In this paper,
we analyze measured delays among thousands of Internet edge networks and
identify key properties that are important for distributed system design.
Furthermore, we derive a simple model of the Internet delay space based on our
analytical findings. This model preserves the relevant metrics far better than
existing models, allows for a compact representation, and can be used to
synthesize delay data for simulations and emulations at a scale where direct
measurement and storage are impractical.
