On 2011-12-14, vijay agrawal <[email protected]> wrote: > Hi David, > ? > I have some very time critical application which i assume may affect while i > sync my existing server with new GPS clock. My most worry part is that if > there is async with server and clock, then they may affect the other > application or clock may reject the sync request with existing server. Hence > i would like to sync in a such way that it will gradually sync the clock > rather than adruptly. > ? > Hence is thare any way to sync slowly?
ntpd will step the clock if it is more than 128ms out. You could look at the time offset, and increase the rate of the clock until you have made up that offset. Or run chrony which will do that for you. Remember it could take a long time. AT 500PPM, it will take a day and a half to get rid of a 1 minute offset. > ? > Regards, > Vijay > > > Message: 3 > Date: Tue, 13 Dec 2011 22:23:54 +0000 > From: David Woolley <[email protected]> > To: [email protected] > Subject: Re: Question on how to Slew time in NTP > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > David J Taylor wrote: > >> and let NTP take care of it all?? Do you have some special requirement? > > I suspect one or both servers are free running. > > Message: 5 > Date: Tue, 13 Dec 2011 22:33:59 +0000 > From: David Woolley <[email protected]> > To: [email protected] > Subject: Re: ntpdate removal is coming > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Richard B. Gilbert wrote: > > Message: 6 > Date: Tue, 13 Dec 2011 22:26:27 +0000 > From: David Woolley <[email protected]> > To: [email protected] > Subject: Re: Question on how to Slew time in NTP > Message-ID: <[email protected]> > Content-Type: text/plain; charset=windows-1252; format=flowed > > vijay agrawal wrote: > > As noted, with proper servers the time and rate of change of time will > behave errors less than those introduced by your process. > >> -? ? ? ? ? Sync the existing server with NTPDate ? b <NEW Server Name> > > This will result in a step, not a slew. > > > > ------------------------------ > > Message: 7 > Date: Tue, 13 Dec 2011 22:39:08 +0000 > From: David Woolley <[email protected]> > To: [email protected] > Subject: Re: ntpdate removal is coming > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Richard B. Gilbert wrote: > >> >> More recent versions of NTP may do better that what I have observed over > > The reason that he can get to the point of diminishing returns quickly > is that they nature of the platform means that point has a relatively > low time quality. > >> the years.? My systems run 24x365 except when Atlantic City Electric >> decides they can't be bothered to supply electricity.? My UPS takes care >> of the brownouts and brief dropouts. > > > > ------------------------------ > > _______________________________________________ > questions mailing list > [email protected] > http://lists.ntp.org/listinfo/questions > > End of questions Digest, Vol 86, Issue 28 > ***************************************** _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
