[arch-general] Leap seconds ntp and chrony?

[Tom Gundersen]

On Wed, Jul 4, 2012 at 11:06 PM, Mauro Santos
<registo.mailling at gmail.com> wrote:
> On 04-07-2012 21:00, Tom Gundersen wrote:
>> On Wed, Jul 4, 2012 at 9:06 PM, Kevin Chadwick <ma1l1ists at yahoo.co.uk> wrote:
>>>> If you have a
>>>> mercurial/git installation even in a small group, I am sure you'll prefer
>>>> accurate timestamps in your commit history. And the list goes on...
>>>
>>> I believe an RTC is perfectly capable of that.
>>
>> I tried to find some data on what to expect from RTC's. I was not very
>> successful, except finding people citing 80-100PPM as typical drift
>> rates (~8 secs/day).
>
> From data I have access to, taken from machines running ntpd, I can say
> the following about the drift in PPM stored in ntpd's drift file:
>
> my laptop: -9.699
> machine 1: -8.762
> machine 2: -443.266
> machine 3: -35.417
>
> Machine 1 is the newest and machine 3 is the oldest.

One more data point: my wrist watch is off by about 20ppm (unless I
forget to wind it, then it is more ;-) ).

-t