nanog mailing list archives
Re: REMINDER: LEAP SECOND
From: Nick Hilliard <nick () foobar org>
Date: Tue, 23 Jun 2015 18:54:42 +0100
On 23/06/2015 18:23, shawn wilson wrote:
NTP causes jumps - not skews, right?
this is implementation dependent. For normal clock differences on ntpd, if you start it with the -x parameter, it will always slew and never step. If you start ntpd without the -x parameter, if the calculated correct time after slewing is out by > 128ms relative to other ntp servers, then after 900 seconds, it will step to the correct time. However in the case of leap seconds, if the operating system implements ntp kernel discipline, then the ntp server will immediately step by the leap second (forwards or backwards), as soon as it receives the leap second notification. It does this on the basis that the kernel supports leap seconds, therefore it's probably the right thing to do. Nick
Current thread:
- Re: REMINDER: LEAP SECOND, (continued)
- Re: REMINDER: LEAP SECOND Mel Beckman (Jun 19)
- Re: REMINDER: LEAP SECOND Harlan Stenn (Jun 20)
- Re: REMINDER: LEAP SECOND Doug Barton (Jun 22)
- Re: REMINDER: LEAP SECOND Harlan Stenn (Jun 22)
- Re: REMINDER: LEAP SECOND Mel Beckman (Jun 23)
- Re: REMINDER: LEAP SECOND Harlan Stenn (Jun 23)
- Re: REMINDER: LEAP SECOND Mel Beckman (Jun 23)
- Re: REMINDER: LEAP SECOND Nick Hilliard (Jun 23)
- Re: REMINDER: LEAP SECOND shawn wilson (Jun 23)
- Re: REMINDER: LEAP SECOND Jared Mauch (Jun 23)
- Re: REMINDER: LEAP SECOND Nick Hilliard (Jun 23)
- Re: REMINDER: LEAP SECOND Harlan Stenn (Jun 23)
- Re: REMINDER: LEAP SECOND Matthew Huff (Jun 23)
- Re: REMINDER: LEAP SECOND Harlan Stenn (Jun 23)
- Re: REMINDER: LEAP SECOND Tore Anderson (Jun 23)
- Re: REMINDER: LEAP SECOND Philip Homburg (Jun 24)
- Re: REMINDER: LEAP SECOND Tony Finch (Jun 24)
- Re: REMINDER: LEAP SECOND Philip Homburg (Jun 24)
- Re: REMINDER: LEAP SECOND Majdi S. Abbas (Jun 24)
- Re: REMINDER: LEAP SECOND Chris Adams (Jun 24)
- Re: REMINDER: LEAP SECOND Tore Anderson (Jun 24)