Re: [chrony-users] Definition of "Max. error" column in tracking logs

[Miroslav Lichvar <mlichvar@xxxxxxxxxx>]

On Fri, Oct 23, 2020 at 09:42:59PM +0530, Abhijith Sethuraj wrote:
> Hello,
> 
> What does the "Max. error" column in tracking logs mean? Looking at the
> source code, it's kind of hard to figure out what's happening.

It's a sum of several different values to estimate the maximum error
of the system clock before two clock updates. That includes the NTP
root distance, which estimates the maximum error of the local NTP
clock due to network delays and stability of the clocks in the chain
up to the primary time server, and the offset and remaining correction
of the system clock relative to the NTP clock.

Basically, if you were running the chronyc tracking command between
the two clock updates many times a second and logged the sum of the
system time offset, root delay/2 and root dispersion, the maximum
value from those should be close to the value reported in the tracking
log.

-- 
Miroslav Lichvar


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