On 2015-02-13, Paul wrote:
> On Fri, Feb 13, 2015 at 12:42 AM, William Unruh wrote:
>
>> OK, so we seem to have two different sets of experiments with very
>> different results. Note that I did not erase the drift file, or restart
>> ntpd after my perturbation.
>>
>
> Okay, I offset my clock by 1
David Lord wrote:
> Rob wrote:
>> Terje Mathisen wrote:
>>> Charles Swiger wrote:
On Feb 12, 2015, at 1:56 AM, Rob wrote:
> However, what I observe is that the plots of the offset show the
> derivative
> of the environment temperature, which unfortunately cannot be control
On Feb 12, 2015, at 11:21 PM, Terje Mathisen wrote:
> I've considered packing some insulation around the crystal, this would tend
> to stabilize (while also increasing) the temperature, but this would also be
> likely to reduce its lifetime, and the motherboard would probably conduct
> heat too
On Fri, Feb 13, 2015 at 12:42 AM, William Unruh wrote:
> OK, so we seem to have two different sets of experiments with very
> different results. Note that I did not erase the drift file, or restart
> ntpd after my perturbation.
>
Okay, I offset my clock by 100ms without restarting ntpd. It took
Rob wrote:
Terje Mathisen wrote:
Charles Swiger wrote:
On Feb 12, 2015, at 1:56 AM, Rob wrote:
However, what I observe is that the plots of the offset show the derivative
of the environment temperature, which unfortunately cannot be controlled
any better. I am considering to locate the cry
Terje Mathisen wrote:
> Charles Swiger wrote:
>> On Feb 12, 2015, at 1:56 AM, Rob wrote:
>>
>>> However, what I observe is that the plots of the offset show the derivative
>>> of the environment temperature, which unfortunately cannot be controlled
>>> any better. I am considering to locate the
On Fri, Feb 13, 2015 at 05:42:54AM +, William Unruh wrote:
> On 2015-02-13, Paul wrote:
> > On Thu, Feb 12, 2015 at 7:27 PM, William Unruh wrote:
> >
> >> It was based on measurements I made with ntpd
> >
> > Are you assuming the numbers I provided are based on theory or were you
> > looking
William Unruh wrote:
> No, that is a hardware solution. There are software solutions-- a
> termistor to meaure the temperature of the crystal ( or somethign
> nearby) which feeds that measurement to the OS. the revised ntp then
> reads the temperature, and corrects the drift rate as a function of
On Feb 12, 2015, at 4:22 PM, Phil W Lee wrote:
> Rick Thomas considered Thu, 12 Feb 2015
> 09:44:30 GMT the perfect time to write:
>
>> Hi All,
>>
>> I’ve got a machine with a really bad clock. When I run NTP on it, the freq
>> goes straight to 500.0 (over a period of a few days) and stays
On Feb 12, 2015, at 3:44 PM, Harlan Stenn wrote:
> While this won't help a lot, if you figure this out please write
> something up and we can find a good place to start putting this
> information at:
>
> https://support.ntp.org/bin/view/Support/TroubleshootingNTP
>
> H
It actually does help!
David Lord wrote:
Solutions that measure the temperature require calibration
for the individual crystal as with the cheap crystals used
the drift per deg C can be either positive or negative and
also depending on "cut" of the crystal can follow a
parabolic or "lazy S" curve.
The only reasonable
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