[ntp:questions] NTP not syncing
puppa at me.la
Fri Nov 8 23:41:34 UTC 2013
On 03/11/2013 01:24, Antonio Marcheselli wrote:
>> That's about it. One of the assumptions made by NTP is that it is
>> running at a fixed clock speed (or rather that the system 'clock
>> source' is). So when that sources frequency is altered for power
>> saving or performance enhancement (you can configure both) , it will
>> be seen as slowing or speeding up when compared with the configured
>> servers timestamps. If for instance, after booting and ntp startup the
>> cpu goes idle, then the frequency could be lowered, causing the clock
>> source to slow down, causing your problem. In older implementations I
>> believe that the cpu frequency lowering also caused the clock source
>> to slow (ex. the TSC was directly linked to the cpu frequency) but I
>> believe that some newer cpus keep the clock source running at a
>> constant frequency and just modify the execution units frequency to
>> avoid this issue.
> Cheers for that, I'll have a look.
The server with the drift file at 450 was rebooted and the drift went to
500+. Restarting the NTP is not helping.
I definitely need to look at the hardware.
I'd like to thank you all, I have investigated on NTP for some time now
and nobody was able to explain things clearly as you did.
Thank you guys!
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