Re: [chrony-users] asymmetric phy delay?

[Nuno Gonçalves <nunojpg@xxxxxxxxx>]

RIght, since if the client is not calibrated also there is no much
advantage in calibrating the server.

And if you are going to this trouble to get some mid term accuracy,
maybe PTP ends up being maybe a better place to spend energy.

Thanks for all the help.

Nuno

On Mon, Aug 10, 2020 at 2:17 PM Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
>
> On Mon, Aug 10, 2020 at 02:09:29PM +0100, Nuno Gonçalves wrote:
> > Thanks for the great support Miroslav.
> >
> > I had no idea about xleave mode. I confirm it changes the behaviour to
> > what I expected.
>
> You are not the first person asking, so maybe I should add it to FAQ.
>
> > Wouldn't it be possible to provide a fixed bias/calibration to be
> > always added to the server timestamp to calibrate a known device when
> > hw timestamps are unavailable?
>
> Server doesn't know (in the current code) which interface will be
> sending the response, so that would be difficult to do. On a client
> side, there is the offset option, which can be used to compensate for
> any asymmetry between the server and client clock (server
> timestamping, switches/routers, network routing, client timestamping,
> PCIe bus).
>
> --
> Miroslav Lichvar
>
>
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