[ntp:questions] Slow convergence loopstats (but nice results)

Martin Burnicki martin.burnicki at burnicki.net
Sun Dec 22 09:54:36 UTC 2013


Uwe Klein wrote:
> Martin Burnicki wrote:
>> There are network switches out there which are PTP-aware and also
>> timestamp incoming and outgoing PTP packets to compensate the
>> introduced packet delay in some way, but there are no switches (AFAIK)
>> which can do this with NTP packets, so even if you used hardware time
>> stamping of NTP packets on NTP end nodes the resulting accuracy would
>> still be worse than with PTP.
>>
>> That's too sad.
>
> What about an RFC for ntp over ptp ;-?

There are a number of possible ways to implement this.

- As a special refclock driver as has been described here

- As an additional daemon which just feeds tthe SHM driver

- Have a PTP daemon running and disciplinin the system time, and just 
use ntpd with it's "local clock" driver to make the disciplined time 
available via NTP ;-)

Martin



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