Bored? Need something to do? You could try helping me with this puzzle
regarding ntpd. This is a rather long message, so if you're otherwise
busy I won't be offended if you skip it.
-- Executive Summary --
The delay and offset values measured by ntpd appear to change slightly
when the order o
On Thu, Feb 25, 2016 at 02:49:48AM -0800, Weber wrote:
> ntp.conf is specifies both servers with minpoll 4/maxpoll 4. Peer and loop
> statistics are enabled.
> By just changing the order of servers in ntp.conf the delay and offset
> values in peerstats are swapped. Now it is A with 60us delay and
Miroslav,
You are a wise man, sir! That is exactly what was happening.
I tried adding a new first server entry in ntp.conf -- for a
non-existent IP on the same subnet. Whatever was going to sleep or
timing out during the delay between polls got refreshed when ntpd tried
to contact the first (
This may or may not be worthwhile, but I thought I'd throw it out there
and see what happens:
Recent work testing some microsecond-accurate NTP servers lead me to an
idea that could improve accuracy of measurements made by ntpd. These NTP
servers have hardware timestamps on receive but that's
Already thought of so it's a good idea! See
https://datatracker.ietf.org/doc/draft-ietf-ntp-checksum-trailer/ for
details.
Danny
On 2/25/2016 4:52 PM, Weber wrote:
> This may or may not be worthwhile, but I thought I'd throw it out there
> and see what happens:
>
> Recent work testing some micro
Thanks for the link. I'm not surprised that someone else already had the
idea. I was poking around and see that 1588 does something similar with
a "follow up" packet.
On 2/25/2016 7:09 PM, Danny Mayer wrote:
Already thought of so it's a good idea! See
https://datatracker.ietf.org/doc/draft-ie
On 2/25/2016 10:29 PM, Weber wrote:
> Thanks for the link. I'm not surprised that someone else already had the
> idea. I was poking around and see that 1588 does something similar with
> a "follow up" packet.
>
I should have mentioned that this checksum trailer extension field is
needed to get th
