[ntp:questions] How do I validate my PPS clocks?
rick.jones2 at hp.com
Wed Feb 27 22:14:12 UTC 2013
unruh <unruh at invalid.ca> wrote:
> Is it possible that some other module is getting the interrupt and
> servicing it, before your module that is feeding pps gets it? 11us
> sounds a lot like the kind of time a interrupt service would
> take. This would mean that every time and interrupt came on your
> line (serial port I assume) something else was in an interrupt
> service which means that that interrupt was triggering that other
> routine-- ie it was trying to service the same interrupt. Either
> that or the pps-ldisk routine is really really really badly written.
> It would be worth trying to track this down.
Shared IRQ perhaps? If Linux then the output of /proc/interrupts
might show if it is shared.
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