Do the Time Warp – the Rocky Horror PTP Show: Verification of Network Time...
summary
Uses Linux PTP v3.1 with the kernel PTP hardwareclock, a Microblocks GPS PPS reference, Intel E210 NICs and a cheap oscilloscope to compare edges. Measurements show nanosecond-scale offsets but occasional hundreds‑of‑nanoseconds jumps when TX timestamp interrupts are missed or EEE/power‑saving settings interfere; half‑duplex or wrong driver support kills sync entirely. Long runs (hours) and PPS‑based checks (PPS to oscilloscope, read absolute time of day) catch failures that short tests miss.
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chapters (13)
- 0:00Start
- 2:47Science Fiction - Double Feature
- 3:31A brief Introduction to PTP-2step sync
- 5:08A brief Introduction to PTP - BMCA
- 11:24PTP in Linux - Userspace
- 13:19PTP in Linux - Measurement Methods
- 16:09Dammit, Janet
- 17:25Demo Setup
- 19:54Reference - Good Measurement
- 20:34Touch-A-Touch-A-Touch-A-Touchy... (3)
- 25:53Reference Startup
- 31:27Do the time warp-common Pitfalls
- 34:17Best Practices
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