Re: [chrony-dev] [GIT] chrony/chrony.git branch, master, updated. 1.26-26-g9a01ccc

[Miroslav Lichvar <mlichvar@xxxxxxxxxx>]

On Tue, Nov 15, 2011 at 02:19:16PM -0800, Bill Unruh wrote:
> One of the issues with ntpd that started me being interested in this whole
> timing stuff, and chrony was the presence of what seemed like oscillations in
> the data. In this latest  one, I again see oscillations, with about a 3000s
> period. Do you have any idea what those could be?

No idea. It looks random to me. I think it should be just output of a
high-pass filter of changes in the clock frequency.

> How long is the typical time scale over which chrony keeps the data to fit the
> linear regression to? What is the polling period?

Polling interval was fixed to 64 seconds, the number of samples is
around 30-40. With higher jitter or more stable clock (longer Allan
intercept) the number of samples would be higher.

-- 
Miroslav Lichvar

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