Re: [ntp:questions] Slow sychronization
Ray rayat...@hotmail.com writes: Hi All, I am running a new version of the NTP daemon, version 4.2.4p6, on a Linux machine with kenel version 2.6.27. Hi! I didn't investigate further, but I see the same effect, and I suspect that there is a mismatch between the kernel interface and ntpd. I'm running several instances of SLES10 SP2 here. When I start the daemon, the peer information shows that all the peer have a offset of about 30 milliseconds. This offset will increase to about 50 milliseconds after an hour. It might take many hour to days before the offset comes down to a few milliseconds. I tried using 'iburst' on the peers to see if this would speed things up, but it made no difference. Are there any settings to speed up this process? Is the a problem with this version of NTP? I'd fiddle with minpoll ;-) Thanks, Ray - ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Slow sychronization
Ulrich Windl ulrich.wi...@rz.uni-regensburg.de writes: Ray rayat...@hotmail.com writes: Hi All, I am running a new version of the NTP daemon, version 4.2.4p6, on a Linux machine with kenel version 2.6.27. Hi! I didn't investigate further, but I see the same effect, and I suspect that there is a mismatch between the kernel interface and ntpd. I'm running several instances of SLES10 SP2 here. Nope. ntp simply has very slow response to errors. Its time constant is a bit over an hour at poll level 6. (ie it decreases the error by about a factor of 2 every hour or so, but there is an overshoot at first.) When I start the daemon, the peer information shows that all the peer have a offset of about 30 milliseconds. This offset will increase to about 50 milliseconds after an hour. It might take many hour to days before the offset comes down to a few milliseconds. I tried using 'iburst' on the peers to see if this would speed things up, but it made no difference. Are there any settings to speed up this process? Is the a problem with this version of NTP? I'd fiddle with minpoll ;-) Thanks, Ray - ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Slow sychronization
Ray wrote: Hi All, I am running a new version of the NTP daemon, version 4.2.4p6, on a Linux machine with kenel version 2.6.27. When I start the daemon, the peer information shows that all the peer have a offset of about 30 milliseconds. This offset will increase to about 50 milliseconds after an hour. It might take many hour to days before the offset comes down to a few milliseconds. I tried using 'iburst' on the peers to see if this would speed things up, but it made no difference. Are there any settings to speed up this process? Is the a problem with this version of NTP? Thanks, Ray - Ntpd will keep your clock well synchronized but it requires many hours to reach that state following a cold start. Performance is somewhat better after a warm start. For best results, start ntpd ten to twelve hours before you need tight synchronization. Let it run continuously as long as you need it. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Slow sychronization
Ray wrote: Hi All, I am running a new version of the NTP daemon, version 4.2.4p6, on a Linux machine with kenel version 2.6.27. When I start the daemon, the peer information shows that all the peer have a offset of about 30 milliseconds. This offset will increase to about 50 milliseconds after an hour. It might take many hour to days before the offset comes down to a few milliseconds. I tried using 'iburst' on the peers to see if this would speed things up, but it made no difference. Are there any settings to speed up this process? Is the a problem with this version of NTP? Thanks, Ray - The topic has been visited several times in the last year or two. The only solution I know of is to let ntpd run continuously. If, for any reason, you need to shut down and reboot regularly, ntpd is probably a poor choice. There is software available called chrony which provides gratification now. I am uncertain as to whether it provides the same accuracy as ntpd. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
