[chrony-dev] adjusting frequency on the basis of temperature

2010-12-07 Thread Michael Ashley
Hi folks, Firstly, thanks for chrony, it is a very nice bit of software. I have some computers in Antarctica that are disconnected from the internet for days (potentially months) at a time. The temperature of these computers can range from -40C to +30C, and over this range there is a large (and h

Re: [chrony-dev] adjusting frequency on the basis of temperature

2010-12-07 Thread Michael Ashley
Hi Bill, > They really go from outside to inside (even that is surely not 30C) ? Outside goes down to -80C or colder, inside we try to keep the experiment at around -20C, but it can go down to -40C or so. And, in extreme situations (e.g., in summertime when the outside ambient is a balmy -30C) th

Re: [chrony-dev] adjusting frequency on the basis of temperature

2010-12-07 Thread Michael Ashley
Hi Miroslav, > The development version supports tempcomp directive, it allows you to > specify a file which contains the measured temperature, and constant, > linear and quadratic coefficients to calculate to correction. Interesting. > Currently, there is a correction limit hardcoded to 10 ppm,

Re: [chrony-dev] adjusting frequency on the basis of temperature

2010-12-12 Thread Michael Ashley
Hi Ed, > Out of curiousity, whilst I doubt Amazon will deliver you one tomorrow, > is a GPS an option to get a time fix? Yes GPS is certainly an option, and our new hardware (currently en-route to Antarctica) has it. > I presume you are stuck with fairly low speed satellite connections > with