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ntpstats 3.1.0

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@github-actions github-actions released this 03 Oct 06:59
v3.1.0
448b0f2

PTP exchanges in the research bench, and NTP over PTP in captures. No breaking changes.

Added

  • PTP exchanges in the bench (completes #29):
    a scenario with protocol = "ptp" simulates the E2E delay mechanism, with a Sync every poll
    seconds and a Delay_Req every delay_interval seconds, each with its own one-way delay and
    timestamp noise. transparent is the fraction of queueing delay that transparent clocks correct.
    The series carries the one-way ms/sm measurements and the slave's offset, so every estimator
    runs on it. New presets ptp-lan (switches without PTP support) and ptp-tc (transparent
    clocks), also on the Simulate page of the web UI.
  • Two PTP client models as estimators: ptp4l (moving-median path delay, the linuxptp PI servo or
    linreg, in closed loop) and sptp (SPTP-style: complete exchanges, path-delay outlier discard,
    PI servo). ntpstats simulate --preset ptp-lan --benchmark scores them with the others.
  • NTP over PTP (RFC 10030, chrony 4.9): NTP messages in the NTP TLV of PTP event messages are
    read from pcap/pcapng files as NTP exchanges. The transparent-clock corrections (PTP correction
    field of the response, Network Correction extension field for the request) are applied as the
    RFC specifies, and refused when it forbids them. Uncorrected values and both corrections are
    kept as columns. Example: examples/data/ntp-over-ptp.pcap.

Fixed

  • ntpstats trace on captures shorter than about one detrend window (15 minutes by default):
    the clock's offset is now removed with at least four windows when there are enough exchanges,
    so its drift no longer appears as delay variation.
  • Web UI overview: the Events card listed "none detected" under a non-zero count.
  • ntpstats simulate --benchmark on PTP presets does not score the first 300 s, while the servos
    lock.

Stable API changes since 3.0.0

  • Changed: PathModel: new method floor; Scenario: new optional fields protocol,
    delay_interval, transparent.
  • Removed: nothing. Code written against the stable API of an earlier release keeps working.
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