| Re: [chrony-users] Isolated time domains |
[ Thread Index |
Date Index
| More chrony.tuxfamily.org/chrony-users Archives
]
On Fri, Dec 06, 2013 at 09:36:52AM -0800, Bill Unruh wrote:
> On Fri, 6 Dec 2013, Miroslav Lichvar wrote:
> >Well, I tried it in the clknetsim simulator. Two chrony clients were
> >synchronized to a chrony server, the clients were started 512 seconds
> >apart and they were using the default minpoll 6 maxpoll 10 values.
> >The wander of the clock on the server was set by the cosine or sine
> >function over 1e6 seconds and the smear started 0.1e6 seconds after
> >the simulation start to give the clients some time to reach the poll
> >of 10.
>
> How different were the time at which the polls occured on the two clients? The
> main problem would come if the two clients were maximally far apart in their
> poll times.
The second client was started 512 second later after the first one to
maximize this effect, this may not work if they don't ramp up the
polling interval similarly. Here are the measurements logs around the
point where the smear starts:
2010-01-02 03:42:20 192.168.123.1 N 5 1111 111 1111 10 10 0.81 2.300e-05
2010-01-02 03:59:41 192.168.123.1 N 5 1111 111 1111 10 10 0.86 1.660e-04
2010-01-02 04:16:50 192.168.123.1 N 5 1111 111 1111 10 10 0.75 4.840e-04
2010-01-02 04:34:11 192.168.123.1 N 5 1111 111 1111 9 10 0.50 1.366e-03
2010-01-02 04:42:48 192.168.123.1 N 5 1111 111 1111 8 9 0.50 1.662e-03
2010-01-02 04:47:05 192.168.123.1 N 5 1111 111 1111 8 8 0.39 8.710e-04
2010-01-02 04:51:23 192.168.123.1 N 5 1111 111 1111 8 8 0.28 9.480e-04
2010-01-02 04:55:41 192.168.123.1 N 5 1111 111 1111 8 8 0.17 1.021e-03
2010-01-02 03:51:23 192.168.123.1 N 5 1111 111 1111 10 10 1.00 1.740e-04
2010-01-02 04:08:31 192.168.123.1 N 5 1111 111 1111 10 10 0.89 5.730e-04
2010-01-02 04:25:45 192.168.123.1 N 5 1111 111 1111 10 10 0.78 9.470e-04
2010-01-02 04:43:00 192.168.123.1 N 5 1111 111 1111 9 10 0.50 2.306e-03
2010-01-02 04:51:36 192.168.123.1 N 5 1111 111 1111 9 9 0.39 1.714e-03
2010-01-02 05:00:16 192.168.123.1 N 5 1111 111 1111 8 9 0.50 2.753e-03
2010-01-02 05:04:33 192.168.123.1 N 5 1111 111 1111 8 8 0.39 1.377e-03
2010-01-02 05:08:51 192.168.123.1 N 5 1111 111 1111 8 8 0.28 1.532e-03
--
Miroslav Lichvar
--
To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "help" in the subject.
Trouble? Email listmaster@xxxxxxxxxxxxxxxxxxxx.