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Intro
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Packet loss is a problem
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Packet loss can occur in the network
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Vagaries of CPU performance
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The slow receiver problem
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Lossless virtual switching is challenging
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Backdraft: A 10,000 Ft. View
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Insights of Backdraft
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Slow receivers manifest at us-scale
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Three components of Backdraft
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Key idea behind the per flow queuing
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Why do we lose packets?
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Design space of the Per Flow Queuing
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Dynamic Per Flow Queuing
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Key idea behind doorbell queues
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How does doorbell queues work?
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Backdraft overlay network
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Homa experiment setup
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Backdraft complements Homa - RPC Completion time
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Evaluating different components of
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Backdraft Takeaways Slow receivers are pervasive
Description:
Explore a 17-minute conference talk from NSDI '22 that introduces Backdraft, a novel lossless virtual switch designed to prevent the slow receiver problem in end-host networking. Delve into the challenges of packet loss in virtual switches and its impact on application performance. Discover how Backdraft combines Dynamic Per-Flow Queuing, Doorbell queues, and a new overlay network to address these issues. Learn about the implementation of Backdraft on BESS and its performance in experiments with real applications on a 100 Gbps cluster. Gain insights into how Backdraft achieves significantly lower tail latency at the 99th percentile when compared to existing solutions.

Backdraft - A Lossless Virtual Switch that Prevents the Slow Receiver Problem

USENIX
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