Re: [Linuxptp-users] E2E Protocol

[Hardik G. <har...@gm...>]

On Fri, Jan 13, 2017 at 4:07 PM, Richard Cochran <ric...@gm...>
wrote:

> On Fri, Jan 13, 2017 at 03:31:14PM +0800, Hardik Gohil wrote:
> > I would like to know the accuracy of time synchronization ?
>
> you mean I need to generate PPS signal from CPU ? after that what should
be next step ?

basically my aim is to synchronize CPU system time to GPS using PTP.


> Then you need to measure it, using a PPS signal for example.
>
> > And the difference between path delay and master offset ?
>
> The path delay is the measured Ethernet propagation time between slave
> and master.
>
> > the value of master offset is the accuracy value ?
>
> No, the master offset is estimated instantaneous time difference
> between the slave and the master.
>

> HTH,
> Richard
>
>
I have a message when I configure GPS to Peer-to-Peer

ptp4l[18815.624]: port 1: received PDELAY_REQ without timestamp
ptp4l[18815.624]: port 1: received PDELAY_REQ without timestamp
ptp4l[18815.624]: port 1: received PDELAY_REQ without timestamp

I cannot know what is happening