[ntp:hackers] u-blox reference clock driver

Udo van den Heuvel udovdh at xs4all.nl
Fri Aug 17 10:08:16 UTC 2018

On 15-08-18 15:12, Udo van den Heuvel via devel wrote:
> I will test if the patches apply to Linux and ntpd.

Kernel patch complains about arm-related files.
I guess we need x86/x86_64 equivalent changes?

> Also I will test linux-rt kernel against current setup to see if it 
> helps improve numbers.

Estimated error went down.
Kernel pll stayed at zero.
ntpq shows offsets that are lower. Jitter also lower.

But how do I get the error more constant?
Currently the `ntpq -c kerninfo` estimated error is quite noisy.

I guess the noise is related to the variance in the interrupt latency?
How will the proposed communication between GPS receiver and computer be 
able to cope with this variance?


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