[ntp:questions] How do I validate my PPS clocks?

Miroslav Lichvar mlichvar at redhat.com
Mon Feb 25 17:24:05 UTC 2013

On Mon, Feb 25, 2013 at 01:44:02PM +0100, Kasper Pedersen wrote:
> From the PPS arrives, and to the kernel timestamps it, is a very long time.
> I wrote this to measure it:
>  http://n1.taur.dk/edgetest.c
> (you will need a linux machine, gcc, and kernel-headers to compile)

Very interesting, thanks! For my machine it shows that the interrupt
latency is around 12 us.

I'm wondering if the kernel module could have an option which would
enable a polling method to time stamp the PPS events.

Miroslav Lichvar

More information about the questions mailing list