[ntp:questions] chrony as a server

William Unruh unruh at invalid.ca
Fri Feb 20 20:16:22 UTC 2015


On 2015-02-19, Rob <nomail at example.com> wrote:
> Miroslav Lichvar <mlichvar at redhat.com> wrote:
>> On Thu, Feb 19, 2015 at 10:05:45AM +0000, Rob wrote:
>>> We have systems in places that are not temperature controlled and then
>>> chrony is much better.  I am looking for the best way to find the
>>> values to use in the tempcomp configuration directive.
>>
>> What resolution does the sensor have? Don't expect good results
>> with 1C or 0.5C resolution that sensors on mainboards typically have.
>
> 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.

It is of course the temperature of the crystal itself that is important.
Ie, the room temp could be constant and the computer varies in its
workload and thus its internal temperature. Unfortunately temp sensors
on the crystal are rare in commodity computers. 



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