[ntp:questions] NTP Performance on WINNT

paul chaofu.chen at gmail.com
Sat Jul 25 14:53:32 UTC 2009


On Jul 21, 1:55 pm, "David J Taylor" <david-tay... at blueyonder.not-this-
part.nor-this.co.uk.invalid> wrote:
> paul wrote:
>
> []
>
> > 10 Windows boxes with offset no greater than 5 ms from abs time is
> > fair enough for me. I will try a local stratum-1 NTP server.
>
> > Cheers,
> > Paul
>
> Paul,
>
> Just for interest, the ntpd.conf for my PC Narvik contains lines like:
>
> _______________________________________
> server 192.168.0.2  iburst maxpoll 6  prefer
> server 192.168.0.7  maxpoll 6
>
> server 0.uk.pool.ntp.org minpoll 10
> server 1.uk.pool.ntp.org minpoll 10
> server 0.europe.pool.ntp.org minpoll 10
> server 1.europe.pool.ntp.org minpoll 10
> _______________________________________
>
> The first two are my local stratum-1 servers (GPS/PPS to Windows XP
> systems, ideally with a light or relatively constant load), and are set
> for 64s polling (maxpoll 6).  To avoid hitting the Internet servers with
> requests as often, they are set for minpoll 10 (1024s), as they are for
> backup in the case that both my stratum-1 servers fail.
>
> A direct connection from the serial GPS/PPS puck is the best, but even if
> you need to go through a serial-USB convertor performance may be adequate
> (I saw about 160us jitter).
>
> Cheers,
> David

Hi David, I am wondering is there any other means to profile NTP
performance, like some kind of hardware setup to measure time offset
of two machine?




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