Miroslav Lichvar <mlich...@redhat.com> wrote: > On Thu, Feb 19, 2015 at 12:48:46PM +0000, Rob wrote: >> I am still finding out what sensor is best to use, we do have a room >> temperature sensor that has .1C resolution and is readable via snmp, >> and there are the usual sensors for board- and inlet air temperature. >> (and of course CPU temperature) >> >> It does not matter if it is only a course indication, the room temperature >> varies over a -10 .. 50C range (don't ask...) and a 1C resolution is not >> bad relative to that. > > In my tests using a sensor with 1C resolution it was barely useful > with NTP sources and 1024s polling interval. If the sensitivity is > around 0.1 ppm per degree, 1C resolution means the compensation > jumping the frequency in 0.1ppm steps. That's a lot, especially if you > compare it to the tracking skew with a refclock.
Ok but of course we are using PPS and a 16 second polling interval. (or maybe the PPS refclock polls even faster although it displays 4 as the poll interval indicator) _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
