Harlan Stenn wrote:
David Lord writes:
... The one big flaw with ntpd is that when motherboard temperature
changes too quickly the ntpd control loop is broken and ntp offset can
rise from < 300u to > 10ms.
That might have been a false alarm.
I've not yet been able to search all the logs. I've not
found the 10ms offsets which might have been on one of the
pcs which is now offline. I have found offsets >> 1ms which
were due to reboots and some > 100ms after internet
connection was lost for 8 hrs (those were mostly during the
following 12hrs whilst ntpd was regaining sync to < 300u).
Some of my pcs are located in unheated rooms and I guess
temperatures can vary from below zero to above 25C when in
full sun. Tonight the back room was around 2C and wiil be
much lower early morning. Other pcs are comfortable in a
heated room at 18-24C.
David
Assuming the above is true (and I have no reason to doubt David's
numbers) I have to wonder if it would be an appropriate GSoC project to
write something that monitors and tracks available temperature sensors
and correlates temperature (perhaps with the first derivative) with the
resulting effect on clock frequency.
Once a suitable data gathering mechanism was in place, we could then
decide on a way to get this information into ntpd or any other software
package that cared about it.
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