Re: [Linuxptp-users] E2E Protocol

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

I would like to know the accuracy of time synchronization ?

And the difference between path delay and master offset ?

the value of master offset is the accuracy value ?



Regards,
Hardik A Gohil

On Fri, Jan 13, 2017 at 11:23 AM, Dale Smith <ds...@us...>
wrote:

> Offset and Delay are in nanoseconds.  The Frequency is (I'm pretty
> sure) in parts-per billion.
>
> -Dale
>
> On Thu, Jan 12, 2017 at 8:40 PM, Hardik Gohil <har...@gm...>
> wrote:
> > Hello,
> >
> > I am working on Linux 3.12 running on TI AM335x.
> >
> > The Test system is GPS connected to CPU over Ethernet and GPS is
> configured
> > to End to End protocol.
> >
> > following are the messages
> > --------------------------------------
> > ptp4l[71468.231]: master offset       -230 s2 freq  -23449 path delay
> > 15359
> > ptp4l[71469.232]: master offset       -185 s2 freq  -23473 path delay
> > 15372
> > ptp4l[71470.233]: master offset         90 s2 freq  -23254 path delay
> > 15503
> > ptp4l[71471.234]: master offset       -321 s2 freq  -23638 path delay
> > 15500
> > ptp4l[71472.234]: master offset        152 s2 freq  -23261 path delay
> > 15500
> > ptp4l[71473.235]: master offset        279 s2 freq  -23088 path delay
> > 15500
> > ptp4l[71474.237]: master offset       -343 s2 freq  -23627 path delay
> > 15500
> > ptp4l[71475.242]: master offset         77 s2 freq  -23310 path delay
> > 15500
> > ptp4l[71476.242]: master offset         51 s2 freq  -23313 path delay
> > 15500
> > ptp4l[71477.242]: master offset         29 s2 freq  -23319 path delay
> > 15500
> > -----------------------------------------
> > phc2sys[71501.627]: sys offset       -75 s2 freq  -23336 delay   3480
> > phc2sys[71502.628]: sys offset        37 s2 freq  -23246 delay   3521
> > phc2sys[71503.629]: sys offset       229 s2 freq  -23043 delay   3480
> > phc2sys[71504.630]: sys offset        -3 s2 freq  -23207 delay   3560
> > phc2sys[71505.631]: sys offset      -203 s2 freq  -23408 delay   3520
> > phc2sys[71506.631]: sys offset      -340 s2 freq  -23605 delay   3440
> > phc2sys[71507.632]: sys offset      -233 s2 freq  -23600 delay   3560
> > phc2sys[71508.633]: sys offset        -8 s2 freq  -23445 delay   3480
> > phc2sys[71509.634]: sys offset       234 s2 freq  -23206 delay   3521
> > phc2sys[71510.634]: sys offset       235 s2 freq  -23135 delay   3560
> > phc2sys[71511.635]: sys offset       162 s2 freq  -23137 delay   3520
> > phc2sys[71512.636]: sys offset        37 s2 freq  -23213 delay   3520
> > phc2sys[71513.637]: sys offset      -252 s2 freq  -23491 delay   3560
> > phc2sys[71514.638]: sys offset       -89 s2 freq  -23404 delay   3560
> > phc2sys[71515.639]: sys offset       269 s2 freq  -23073 delay   3480
> > ----------------------------------------------
> >
> >  I am trying to understand this messages.
> >
> >  how do I know whether system time is synced to GPS and what is accuracy
> ??
> >
> >
> >
> >
> > Regards,
> > Hardik A Gohil
> >
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