| Re: [chrony-users] Chrony offset and stability adjustments? |
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On Mon, Jan 07, 2019 at 03:11:32PM +0000, LeBlanc, Daniel James wrote:
> Hi Miroslav.
>
> The requirement that we are trying to meet is " Time accuracy must be within 1 ms of true time.", as described in Section 5.18 of https://www.nena.org/resource/resmgr/standards/NENA-STA-010.2_i3_Architectu.pdf.
Interesting.
> I am currently connected to the NRC Internet-accessible time servers from our lab environment. I am so close to meeting the spec (~1.3ms reported root dispersion) that I thought I would reach out to the experts to see if there was some adjustment that I might try. :-)
To me it sounds like you will need your own NTP server with a HW
reference clock (e.g. GPS).
>
> I am running chrony within a virtual environment (VM) so have disabled rtcsync and enabled rtcfile within the .conf file. I will look at reducing the maxclockerror and increasing the minsamples setting. Any additional items to consider would be appreciated!
I wouldn't recommend doing that unless you have verified the stability
of the clock, e.g. by comparing it to a reference clock. In any case,
that can only reduce the local peer dispersion. If most of the root
distance is from the network delay, it won't help much.
--
Miroslav Lichvar
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