[LEAPSECS] Bloomberg announced its smear

[Martin Burnicki]

Christopher Hoover wrote:
> This I believe is the most recent public statement on the topic:
> 
> https://cloudplatform.googleblog.com/2015/05/Got-a-second-A-leap-second-that-is-Be-ready-for-June-30th.html
> 
> One could imagine having a public ntp pool on the interwebs that
> implemented smearing.  (I know this will be heresy to some.)

The current version of ntpd supports smearing, if support is explicitly
compiled in and then enabled in the ntp.conf file.

See:
http://bugs.ntp.org/show_bug.cgi?id=2855

This implements leap smearing using a cosine approach, like Google did
it initially, and the smear interval is such that smearing is finished
at the end of the leap second, so the beginning of the next day / hour /
minute is accurate.

And this should *not* be used with pool servers or other public servers.

A summary can be found here:
https://www.meinbergglobal.com/download/burnicki/Leap%20Second%20Smearing%20With%20NTP.pdf

Martin