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

[Anthony de Boer]

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