Red Hat Bugzilla – Bug 1047
Xntpd will mis-synchronize
Last modified: 2008-05-01 11:37:49 EDT
Xntpd will improperly synchronize the clock.
The problem does not appear so much to be in the code, as in
one of the constants defined by the specifications -- it is
A patch is coming.
Brief summary: Xntpd synchronzes when the "error" is less
than 1; this causes problems with all of the root clocks, as
they do not work that smoothly. Thus, they have a lot of
time steps; so do other sites that synch to them.
In addition, if you are doing a file transfer, xntpd's
concept of error will still go well below 1 during the file
transfer, and a 2-4 second error will be stepped into your
This patch lowers the treshold to .025.
I have been running this patch on xntpd-3.51 for over a year
on another machine; I have just applied it to our internal
time server today.
(yes, this really should be back-prop'd to the maintainers
of xntpd; I figured that it would be more likely to be
accepted if it had your backing as well)
Please reopen this bug with the patch. The Right Thing To Do
is to send the patch to the xntp3 crowd -- we'll be happy
to include the patch with an update of xntp3.