| Re: [chrony-dev] Time for a release? |
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On Thu, Oct 07, 2010 at 09:02:56AM -0700, Bill Unruh wrote:
> >- improve the code which adjusts the polling interval between
> > minpoll and maxpoll, the current one seems to work quite badly
>
> In what sense "badly"? I looked at it for a while, but did not see how one of
> the other choice would be better. What are you trying to maximize?
It uses too long intervals when jitter is low (the accuracy suffers)
and too short intervals when jitter is high (wasting network
bandwidth).
The most promising idea I came up so far is to adjust the interval
based on number of samples kept in sourcestats, so it remains close to
a fixed number. This would be configurable, a higher value would mean
chrony should try to keep the buffer more filled and thus have better
accuracy. The default would be set so chrony uses less or same
resources than ntpd with same minpoll and maxpoll, while keeping
better accuracy.
--
Miroslav Lichvar
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