[Linuxptp-users] Question about delay estimation and offset

[Víctor V. R. <vic...@ug...>]

Hi all,

We are doing some research based on ptp4l and I noticed that it doesn’t perform delay estimation and offset estimation on the same cycle. That is, the client updates only the estimated delay when it receives a DELAY_RESP and then updates the offset estimation (and corrects the clock) when receiving next cycle’s SYNC message. Is there a specific reasoning behind this implementation decision?

I actually tried my hand at changing the code locally so it does everything on the same cycle (both delay and offset estimation when receiving a DELAY_RESP) and, although it works, performance is noticeably worse than the base ptp4l implementation. This is the issue I’m trying to figure out.

Best regards,
Víctor

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Víctor Vázquez
PhD Student
Department of Computer Engineering, Automatics and Robotics (ICAR)
Time-based Technologies and Networks Lab

University of Granada
Calle Periodista Rafael Gómez Montero, 2
CITIC-UGR, Office D1-2
18014 Granada, Spain