"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 <[email protected]> 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 > --- > Talk Mailing List > [email protected] > http://gtalug.org/mailman/listinfo/talk >
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