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Krzysztof kuhy Rudnicki
836f4ef2de
Diagnosing "Steam downloads are slow" kept pointing at the ISP because every averaged measurement showed a steady ~170 Mbps. Sampling at 1s instead of 5s showed that plateau does not exist: the link alternates between ~450 Mbps bursts and multi-second stalls. Effective rate is burst x duty_cycle, and only the second factor was wrong. steam-download-duty.sh reports those two factors separately, which is what the Steam UI cannot do. line-speed-probe.sh separates burst from sustained throughput, because a single stream tops out near 180 Mbps on this line and reads convincingly as ISP shaping when it is not — a many-connection swarm reaches 986 Mbps with zero retransmits. Arithmetic is extracted into pure helpers with main() behind a BASH_SOURCE guard so the bats suite can source them without starting a measurement. install.sh installs bats and links both scripts onto PATH. Note: no CI workflow runs .sh/.bats tests, including the four shell tests that predate this one, so the suite is manual-only for now. |
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