PPS undersampling

[Hal Murray]

> Hm. I think I get it - and you've just added a pretty powerful reason to
> eventually pull the refclocks into a separate daemon by telling me I need to
> get ntpd itself out of the PPS-watching business entirely in order to get
> rid of that timer. 

The reason I want to get rid of the every-second timer is to save power when 
operating on battery with no refclocks.

If you have a PPS, you have to take an interrupt every second.  I'm not a 
wizard on that area.  It would be interesting to know if you can get useful 
interrupt responses when starting from a power-save mode.  Similarly, can you 
wakeup in time to get data from a serial port without dropping any 
characters?  It may be that power-save just won't happen if you are using 
refclocks.

Moving the PPS processing out of ntpd doesn't change any of that.


-- 
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