Re: [gpsd-dev] [PATCH] Improve chrony examples in time howto.

[Greg Troxel]

"Eric S. Raymond" <address@hidden> writes:

> Miroslav Lichvar <address@hidden>:
>> On Mon, Nov 04, 2013 at 07:18:16AM -0500, Greg Troxel wrote:
>> > Miroslav Lichvar <address@hidden> writes:
>> > 
>> > > - recommended place for the drift file is in /var/lib
>> > 
>> > That sounds linux specific.  On NetBSD (and probably others, following
>> > hier(7) from 4.4BSD) it's /var/db/ntp.drift.
>> > I'm unclear on chrony, but it belongs in /var/db as well.
>> 
>> Ok. The ntpd example in the document should be probably updated too.
>> 
>> Please note that the performance of chronyd on non-Linux systems may
>> not be adequate for the precision of the PPS source. Its system driver
>> will use only the old adjtime() system call to discipline the clock,
>> there is no correction of the frequency offset and the resolution is
>> limited to microsecond.
>
> Ship another patch to this effect, please.

And please be more measured about "adequate".  The notion that there
are sub-microsecond issues can be a bit hysterical on systems that don't
have all other issues addressed.

(I haven't gotten around to trying chrony yet.)

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