[time-nuts] Beaglebone NTP server

[Chris Albertson]

On Sun, Dec 7, 2014 at 12:09 PM, folkert <folkert at vanheusden.com> wrote:

>
> On my rpi the jitter is between 2 and 10us iirc but it is a while since
> I tested it. A quick peak shows me currently 3us jitter. Not bad for a
> userspace solution imho.


Really?   The PPS to GPIO interface is handles in user space?  It is not
interrupt driven?
In the implementations I've seen the critical real time work is done inside
the PPS interrupt handler and then of course ntpd runs in userland and can
take as much time as it needs

-- 

Chris Albertson
Redondo Beach, California