Optimizing Overlay-Based Virtual Networking Through Optimistic Interrupts and Cut-Through Forwarding

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Provided by: Institute of Electrical & Electronic Engineers
Topic: Cloud
Format: PDF
Overlay-based virtual networking provides a powerful model for realizing virtual distributed and parallel computing systems with strong isolation, portability, and recoverability properties. However, in extremely high throughput and low latency networks, such overlays can suffer from bandwidth and latency limitations, which is of particular concern if the authors want to apply the model in HPC environments. Through careful study of an existing very high performance overlay-based virtual network system, they have identified two core issues limiting performance: delayed and/or excessive virtual interrupt delivery into guests, and copies between host and guest data buffers done during encapsulation.
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