[LEAPSECS] leap second festivities?

Martin Burnicki martin.burnicki at burnicki.net
Thu Jul 2 05:06:35 EDT 2015


Poul-Henning Kamp wrote:
> --------
> In message <5593EB55.6090401 at meinberg.de>, Martin Burnicki writes:
>
>>> The maximum offset with the linear smear was almost three times larger
>>> than with the cosine smear. I think there is a different reason why
>>> they switched to the linear smear.
>
> I fear that test has sufficient power to reveal the full picture.
>
> The NTPD PLL is quite temperamental, and when combined with the
> median filter and a poll rate of 2048 seconds, things can get quite
> "interesting".
>
> I'm pretty sure that the linear smear interacts better with the
> median filter at high poll intervals.
>
>> I'm going to run a test with a linear approach, too.
>
> Please run it with "minpoll N maxpoll N" for N in (4...11)

Will do. However, for a general picture we'll need results for different 
smear intervals, linear or cosine smearing for each interval, as well as 
several polling intervals on the clients for the combination of each of 
the above.

This will take some time.

Martin



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