[ntp:questions] Google and leap seconds

unruh unruh at wormhole.physics.ubc.ca
Wed Sep 21 22:19:45 UTC 2011

On 2011-09-21, Harlan Stenn <stenn at ntp.org> wrote:
> Bill wrote:
>> Some operating systems (eg Linux) have the ability to do a much faster
>> than 500PPM rate change (100000PPM in the case of Linux) but ntp does
>> not make use of that. 
> ... because it would violate the assumptions and rules about the loop
> behavior (I'm painting with a wide brush here).  If you want a system

? But that 500PPM was an arbitrary and random value chosed X years ago. 

> that is designed to work with a faster slew rate that's fine, but then
> you also have to consider legacy and interoperability issues.

sure. But what legacy issues do you have in mind? 

> It also goes to timestamp correlation issues.

It would seem to me that a step (infinite PPM) would be far far worse.
ntpd does NOT limit the slew rate to 500PPM. It limits it to infinite

> H

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