nanog mailing list archives
Re: REMINDER: Leap Second
From: Joe Klein <jsklein () gmail com>
Date: Sun, 25 Jan 2015 16:17:33 -0500
I spoke on time hacking and ntp 3 years ago at shmoocon. On Jan 25, 2015 12:28 PM, "Ken Chase" <math () sizone org> wrote:
I think devices would likely be fine, unless they're concerned with reconciling a leap-second updated ntp source and one that's not. Who wins? For most NTPs I would guess they're slaves to whatever feed and just 'believe' whatever they're told. (Sounds like a security hole waiting for high frequency trader types, q.v. http://www.theverge.com/2013/10/3/4798542/whats-faster-than-a-light-speed-trade-inside-the-sketchy-world-of ) Can't we just subscribe to a leapsmeary NTP feed if we care to have no big leap (I dont mind)? Isnt NIST offering this? /kc On Sun, Jan 25, 2015 at 06:01:40PM +0100, Karsten Elfenbein said: >Hi, > >Java had some issues with 100% CPU usage when NTP was running during >the additional second in 2012. > http://blog.wpkg.org/2012/07/01/java-leap-second-bug-30-june-1-july-2012-fix/ > >Google did something different to get the extra second in: > http://googleblog.blogspot.de/2011/09/time-technology-and-leaping-seconds.html > >Most devices probably don't even know about the leap second coming as >that would require a firmware upgrade. > > >Karsten > >2015-01-25 16:19 GMT+01:00 Mike. <the.lists () mgm51 com>: >> On 1/25/2015 at 9:37 AM Jay Ashworth wrote: >> >> |This June 30th, 235959UTC will be followed immediately by 235960UTC. >> | >> |What will /your/ devices do? >> ============= >> >> >> I've always wondered why this is such a big issue, and why it's done >> as it is. >> >> In UNIX, for instance, time is measured as the number of seconds >> since the UNIX epoch. imo, the counting of the number of seconds >> should not be "adjusted", unless there's a time warp of some sort. >> The leap second adjustment should be in the display of the time, >> i.e., similar to how time zones are handled. >> >> >> fwiw >> >> >> -- Ken Chase - math () sizone org Toronto
Current thread:
- REMINDER: Leap Second Jay Ashworth (Jan 25)
- Re: REMINDER: Leap Second Mike. (Jan 25)
- Re: REMINDER: Leap Second Karsten Elfenbein (Jan 25)
- Re: REMINDER: Leap Second Ken Chase (Jan 25)
- Re: REMINDER: Leap Second Joe Klein (Jan 25)
- Re: REMINDER: Leap Second Karsten Elfenbein (Jan 25)
- Re: REMINDER: Leap Second John Levine (Jan 25)
- Re: REMINDER: Leap Second Valdis . Kletnieks (Jan 25)
- Re: REMINDER: Leap Second Ken Chase (Jan 25)
- Re: REMINDER: Leap Second Stephen Satchell (Jan 25)
- Re: REMINDER: Leap Second Barney Wolff (Jan 25)
- Re: REMINDER: Leap Second TR Shaw (Jan 25)
- Re: REMINDER: Leap Second Barney Wolff (Jan 26)
- Re: REMINDER: Leap Second John Levine (Jan 26)
- Re: REMINDER: Leap Second Barry Shein (Jan 26)
- Re: REMINDER: Leap Second Mike. (Jan 25)