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Re: [Ntp] Leap second draft

Watson Ladd <watsonbladd@gmail.com> Sat, 30 March 2019 20:43 UTC

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From: Watson Ladd <watsonbladd@gmail.com>
Date: Sat, 30 Mar 2019 13:42:44 -0700
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To: Warner Losh <imp@bsdimp.com>
Cc: Kurt Roeckx <kurt@roeckx.be>, Steve Allen <sla@ucolick.org>, NTP WG <ntp@ietf.org>
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Subject: Re: [Ntp] Leap second draft
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On Sat, Mar 30, 2019, 8:43 AM Warner Losh <imp@bsdimp.com> wrote:

>
>
> On Sat, Mar 30, 2019 at 9:29 AM Kurt Roeckx <kurt@roeckx.be> wrote:
>
>> On Sat, Mar 30, 2019 at 06:33:48AM -0700, Steve Allen wrote:
>> > Daniel Franke notes that I did not send this and the
>> > next message to the list.
>> >
>> > Greetings Daniel Franke,
>> > On Fri 2019-03-29T20:57:42+0100 Daniel Franke hath writ:
>> >
>> > > Network Working Group                                          D.
>> Franke
>> > > Internet-Draft
>> Akamai
>> > > Updates: 5905 (if approved)                               March 29,
>> 2019
>> > > Intended status: Standards Track
>> > > Expires: September 30, 2019
>> >
>> > >    At their inception in 1972, UTC and TAI were equal.  Since then,
>> >
>> > No, please look at the second plot on
>> > https://www.ucolick.org/~sla/leapsecs/amsci.html
>> > and at the third plot on
>> > https://www.ucolick.org/~sla/leapsecs/deltat.html
>> >
>> > As of 1972 TAI - UTC was reset to exactly 10 SI seconds
>> > Since then there have been 27 leap seconds.
>> [...]
>>
>> I think this is all not very relevant for NTP where we care about
>> the current time, not about what happened in 1972. I'm not sure
>> we need all that historic information in the draft.
>>
>
> We definitely need that it was exactly 10s in 1972, as opposed to 0. And
> we need statements that things were messy before 1972. This information is
> 'out there' but hard to find and difficult to properly interpret.
>
> And it's less obscure than the crazy notion that leap seconds could happen
> any time other than June and December as a practical matter. TF.460 says
> those are the primary dates, with March / September being the secondary
> dates though at the end of any month is possible. Given the large number of
> bugs we hit every single leap second in June and December, March and
> September just might work in enough places not to sow chaos, but a leap
> second at the end of February would be pure chaos.. At least as a practical
> matter. Untested code is buggy code.
>

Especially in 2020!


> Warner
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