Re: [QRTN] Re: [chrony-dev] Adding information to tracking

[ Thread Index | Date Index | More chrony.tuxfamily.org/chrony-dev Archives ]


Hi,

In my company's application (an instrument data acquisition system) we monitor for steps because they create discontinuities across which timestamps can't be easily ordered.  During slews you can still order timestamps, even if the interval isn't as accurate.  We actually ended up counting "number of steps since recording started" so we could give timestamps a total order.

-Will

On 2023-10-26 8:54 a.m., Miroslav Lichvar wrote:
CAUTION: This email originated from outside your organization. Exercise caution when opening attachments or on clicking links from unknown senders.

On Wed, Oct 25, 2023 at 06:07:04PM -0400, Jonathan Sanabria wrote:
In my current monitor for steps we would have to track the machine's system
time and check for jumps like that, though parsing the tracking information
would be much safer and direct.
Why not check the system log for the "System clock was stepped"
message?

If the last step was reported in tracking, you wouldn't know if there
wasn't a bigger step since the previous chronyc tracking call as steps
can happen in quick succession if there are changes in the source
selection.

Also, it's not very clear to me why you care about steps but not
larger slews. If you need to know if the maximum estimated error of
the clock is below a specific value, you should be monitoring the last
field in the tracking.log file.


--
To unsubscribe email chrony-dev-request@xxxxxxxxxxxxxxxxxxxx with "unsubscribe" in the subject.
For help email chrony-dev-request@xxxxxxxxxxxxxxxxxxxx with "help" in the subject.
Trouble?  Email listmaster@xxxxxxxxxxxxxxxxxxxx.


Mail converted by MHonArc 2.6.19+ http://listengine.tuxfamily.org/