On 2019-06-21, David Woolley <david@ex.djwhome.demon.invalid> wrote: > On 21/06/2019 12:26, Thomas Laus wrote: >> Will either isolation solution have direct access to the computer >> CPU? The GPS clock will need the ability to directly adjust the >> frequency of the CPU to achieve expected results for a Stratum 1 >> serve > > I'm not aware of anything in ntpd that directly adjusts the CPU > frequency and there generally isn't any fine grained way of doing that. > ntpd normally works by adjusting how many cycles of a fixed frequency > represent a certain time period, and that is a software operation. > I guess that I should have stated this reply a little differently. I meant to say that ntpd will need direct access to the hardware that it runs on. That means a hardware serial port for pulse per second and the running system clock frequency. The ntpd program does not perform well when running on a virtual machine nor in a isolated security environment similar to a freebsd jail. My advice to the original poster is to get ntpd running as a stratum 1 source and then connect it to the internet with the fewest number of inter- mediate hops in between. I doubt that this is possible if the Stratum 1 time source can be connected through any buffer device to the internet and still serve Stratum 1 time.
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