[GTALUG] NTP's Fate Hinges On 'Father Time' - InformationWeek

[David Thornton]

"There is PTP support in Linux, but you need an Ethernet card with the
right timestamping feature plugged into a switch that does PTP too."

You can do PTP over IP but I understand you can also deploy "dedicated"
networks that JUST do PTP ( no ip ).

It is the dedicate nets you are talking about ?

The sexiest PTP hardware I've seen is the solarflare stuff.

David




On Sun, Mar 15, 2015 at 5:58 PM, Anthony de Boer <adb at adb.ca> wrote:

> Stewart C. Russell wrote:
> > On 2015-03-14 10:09 PM, David Thornton wrote:
> > > My finance client's use ptp not ntp.
> >
> > Is PTP particularly hard to use? It looks like an ISO standard, so will
> > likely be fiddly but complete.
>
> Accuracy numbers in PTP are measured in nanoseconds, while the NTP world
> talks milliseconds.  So if you have that sort of accuracy requirement
> (power system phasors, etc) you probably want PTP with the appropriate
> dedicated hardware, while garden-variety Unix admins just want log
> records to show up with the right second.
>
> There is PTP support in Linux, but you need an Ethernet card with the
> right timestamping feature plugged into a switch that does PTP too.
>
> Meanwhile, ntpd is getting a bit long in the tooth[0] and the ntimed
> project looks interesting.
>
> [0] "support for hardware clocks EBay has never heard of"
>
> --
> Anthony de Boer
> ---
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