[time-nuts] Google NTP Servers and smearing leap seconds...
xaos at darksmile.net
xaos at darksmile.net
Fri Sep 16 14:45:29 UTC 2011
You can forget Wall St. firms and Banks for starters.
They need sub-microsecond accurate timing as some instruments (Forex)
are moving to <10 microsecond latency from order entry to order ack.
Although some software (FIXX) needs a lot of work to get there, they
are moving in that direction.
-George, N2FGX
Quoting shalimr9 at gmail.com:
> That would be nice it is were a standard and everybody was doing it,
> because otherwise, for a day, your own network might be happy, but
> if you have any app that needs to communicate with the outside
> world, you are in a lot of hurt.
>
> Didier KO4BB
>
> Sent from my BlackBerry Wireless thingy while I do other things...
>
> -----Original Message-----
> From: Doug Calvert <dfc-list at douglasfcalvert.net>
> Sender: time-nuts-bounces at febo.com
> Date: Thu, 15 Sep 2011 16:34:39
> To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
> <time-nuts at febo.com>
> Subject: [time-nuts] Google NTP Servers and smearing leap seconds...
>
> Time Technology and leaping seconds
>
> http://googleblog.blogspot.com/2011/09/time-technology-and-leaping-seconds.html
>
> "The solution we came up with came to be known as the “leap smear.” We
> modified our internal NTP servers to gradually add a couple of
> milliseconds to every update, varying over a time window before the
> moment when the leap second actually happens. This meant that when it
> became time to add an extra second at midnight, our clocks had already
> taken this into account, by skewing the time over the course of the
> day. All of our servers were then able to continue as normal with the
> new year, blissfully unaware that a leap second had just occurred. We
> plan to use this “leap smear” technique again in the future, when new
> leap seconds are announced by the IERS."
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list