| Re: [chrony-users] Searching for reasoning on design decisions |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Searching for reasoning on design decisions
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Wed, 28 Jun 2023 09:13:44 +0200
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On Tue, Jun 27, 2023 at 09:28:39PM +0200, Julian Steinmann wrote:
> However, I haven't found much reasoning why e.g. weighted linear regression
> is used in chrony for NTP samples, whilst a robust linear regression (Least
> Absolute Deviations) is used for RTC samples and manual input (I hope I'm
> not mistaken in my reading of the code).
NTP samples have a delay, which works well as a weight. RTC and manual
samples don't have a delay or anything that could be used as a weight.
There were some unsuccessful attempts to combine weighting with the
robust regression. This needs more research.
> Is there some place where these design decisions are justified?
No, there is just the source code.
--
Miroslav Lichvar
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