Re: [chrony-dev] Leap second handling

[Frank Muzzulini <frank.muzzulini@xxxxxxxxxxxx>]

On 07/13/12 19:01, Miroslav Lichvar wrote:
> I think there are these options:
> - let the kernel handle the leap second
> - step the clock manually (settimeofday() or adjtimex(ADJ_SETOFFSET))
> - smear both local time and served time, drop the leap announcement
> - smear only local time, keep the announcement and always serve UTC

Option 1 should remain the default.

Option 4 is what I suggested and I think it also fits best into the 
normal behaviour of chrony.

When I started working with chrony, I was surprised to notice that when 
it encounters an error, although adapting the local time slowly, it 
immediately provides the new time. In hindsight I think that is how it 
should be, only I was used to the behaviour of ntpd. Option 4 treats the 
leap second in the same way while working around the inability of 
operating systems to handle the leap second smoothly.

> I really hope leap seconds will be abolished before the next one
> happens. :)

It would simplify a lot, but I doubt that it will happen ;)

Regards,
Frank

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