Re: [Linuxptp-users] E2E Protocol

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

Hello,

Can anybody help me to understand this message

I have a message when I configure GPS to work PTP in Peer-to-Peer mode

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



Regards,
Hardik A Gohil

On Fri, Jan 13, 2017 at 4:20 PM, Hardik Gohil <har...@gm...>
wrote:

>
>
> 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
>
>