David, It appears that you may misunderstand my observation? Raspberry-Pi servers seem to be economical and functional as NTP servers, but how well do they work in the network configuration that I am using. Yes, there are things that I can do to have a more accurate server; but how well does NTP work in default usage?
Regards, Ed ________________________________________ From: questions-bounces+edward.mischanko=arcelormittal....@lists.ntp.org [questions-bounces+edward.mischanko=arcelormittal....@lists.ntp.org] on behalf of David Taylor [[email protected]] Sent: Monday, December 02, 2013 11:07 AM To: [email protected] Subject: Re: [ntp:questions] Bug 2341 - ntpd fails to keep up with clock drift at poll>7 On 02/12/2013 16:24, Brian Inglis wrote: [] > When I ran current stable under Win 7 with only network servers I found > I had to drop minpoll to 4 (default is 6) so iburst would quickly get > a good offset and pull drift down from initial out-to-lunch estimate > compared to drift file contents. > > Once drift got pulled down close to hardware levels, poll would increase > and further pull down offset < 10ms, then at longer poll intervals, > both drift and offset would slowly get more accurate over a period of > about three weeks. > > About then patch Tuesday would come around and it would be back to > square one! > > I had to ensure BIOS spread spectrum and OS power saving were turned off > and pick servers that were not busy, with no drops or steps, delay < 90ms, > jitter < 20ms, offset < 10ms. > > As pings were often blocked, I used traceroute (tracert on Windows) to do > initial delay estimates, when those were not also blocked in a DMZ, and > tried ntpq -p -c rv -c cv as a final check out when possible. > > I try to pick about four good quality servers which may be quite distant, > but within the criteria above, and four decent fairly local servers for > those times when interconnects fail and only local servers are reachable. > > One thing I have noticed is that my NTP clock (HPET) is being reported > as having ~28PPM drift where my hardware is only ~.9PPM! .. which all seems a lot of effort compared to getting your own stratum-1 server with no soldering for around US $150: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html http://ava.upuaut.net/store/index.php?route=product/product&path=59_60&product_id=95 -- Cheers, David Web: http://www.satsignal.eu _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
