Re: [chrony-dev] [GIT] chrony/chrony.git branch, master, updated. 2.1.1-89-g3cd32ed

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

> commit 1b2510e4b260eed2e7fef9e539cd031bd89898c9
> Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
> Date:   Tue Sep 15 15:24:28 2015 +0200
>
>    sys_linux: use timex driver
>
>    Remove functions that are included in the new timex driver. Keep only
>    functions that have extended functionality, i.e. read and set the
>    frequency using the timex tick field and apply step offset with
>    ADJ_SETOFFSET.
>
>    Merge the code from wrap_adjtimex.c that is still needed with
>    sys_linux.c and remove the file.
>
> commit e735be59a7d6077414244d2c54fcabb736e0f3ff
> Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
> Date:   Tue Sep 15 15:03:37 2015 +0200
>
>    sys: add generic timex driver
>
>    This is based on sys_linux.c and wrap_adjtimex.c. It's intended for all
>    systems that support the adjtimex() or ntp_adjtime() system call. The
>    driver functions can be replaced with extended system-specific versions
>    (e.g. to control the frequency with the tick field on Linux).
>
> commit 5190539ce1efe0a9fc14e2197017f8cb4bb6f0e6
> Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
> Date:   Thu Sep 10 15:34:56 2015 +0200
>
>    test: add tests for system adjtime() and ntp_adjtime()
>
>    Include a test program to determine how the adjtime() implementation
>    behaves. Check the range of supported offset, support for readonly
>    operation, and slew rate with different update intervals and offsets.
>
>    Also, add a test for ntp_adjtime() to check what frequency range it
>    supports.

I am not sure what the consequences of this are, but if it limits chronyd on
Linux to 500PPM adjustment, it is a real step back. One of the advantages of
chrony has always been that it could rapidly adjust the time by slewing, since
it could slew up to a rate of 1/10. (ten seconds to slew a second) and could
remove the coarse adjustment of the rate ( so if you clock was out by 300PPM
on average, it could still use the full 500PPM adjustment width of the fine
control. ) To go the silly ntpd rate limits of just 500PPM is to me a major
change in chrony and to me a backward step. Of course I may be misinterpreting
this.

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