Steve Kostecke wrote: > Spoon wrote: > >> Is it possible to run NTP in a mode where it does not try to correct >> the time offset, but only correct the frequency offset (skew)? > > Yes. > > Provide your ntpd with a stable PPS source and use the Undisciplined > Local Clock.
I am running Linux 2.6.20.3-rt8 I don't think vanilla 2.6 supports PPS sources at the moment? http://lkml.org/lkml/2007/2/16/303 Surely there must be some experimental patches? http://unix.freshmeat.net/projects/ppskit/ http://www.kernel.org/pub/linux/daemons/ntp/PPS/ In my situation, I don't care what time it is, but my clock needs to tick at the correct rate. I've found the following articles: http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#S-CONFIG-ADV-PPS http://www.cis.udel.edu/~mills/ntp/html/pps.html Can you suggest additional resources? I think I can't use GPS because the computer is located in a server room underground. Are there other PPS sources? I've read about rubidium and cesium clock sources. How expensive are they? Do they come on a PCI board that can fit inside a 1U case? Regards. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
