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The TCP flow started first and in a thread of the runner; two TCP flows
split 0.31 to 0.56. Now every flow is a process started at once, run
40 s, counted from 10 s on.
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tbf with netem under it lost tbf's queue (netem became it), and the
answers queued behind the data. Now each way has its netem, the way to
the receivers' ports then a tbf whose queue holds a round trip; the way
back does not queue. transport.c takes its listener's port
(TRANSPORT_PORT).
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020-lossy-paths/run.py runs each case in an unprivileged namespace: a
50 Mbit/s tbf bottleneck under netem's delay, jitter and loss, both
ways. A link may send without UDP GSO (pure_link_gso), as netem takes a
burst as one packet; quinn the same (QUIC_GSO=0). transport.c and the
quinn harness give the records handed over in each 100 ms, and at a
steady rate the time each took; TCP CUBIC flows run beside them.
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