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One stream across a 10Gbps transatlantic link crawls while ping looks perfect. What is limiting the throughput?

Latency fine, loss low, link idle, yet a single copy takes hours. The arithmetic of bandwidth-delay product settles this question before any tool opens.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Latency fine, loss low, link idle, yet a single copy takes hours. The arithmetic of bandwidth-delay product settles this question before any tool opens.

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Next in this trackAfter scaling workers the app dies with too many open files. How do you raise the limit so it actually sticks?Next in this trackA worker vanished overnight with nothing in its logs. Show me how you read OOM killer output to explain the death.Next in this trackSpin up two isolated network stacks on one box and make them talk. Walk me through namespaces and veth pairs.

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