Wesley J. Landaker wrote:
> Can anyone give me some suggestions on inexpensive (< $100) OEM GPS
> units that support NMEA and 1PPS for use with NTP? Or any non-GPS
> hardware clock sources that anyone can suggest?
>
> I am already aware of the Garmin GPS 18 LVC, which seems the most
> promising, b
In article <[EMAIL PROTECTED]>,
"Wesley J. Landaker" <[EMAIL PROTECTED]> writes:
>Can anyone give me some suggestions on inexpensive (< $100) OEM GPS
>units that support NMEA and 1PPS for use with NTP? Or any non-GPS
>hardware clock sources that anyone can suggest?
>
>I am already aware of the Gar
In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Svein Skogen) wrote:
> Wesley J. Landaker wrote:
> > Can anyone give me some suggestions on inexpensive (< $100) OEM GPS
> > units that support NMEA and 1PPS for use with NTP? Or any non-GPS
I'm not sure you will get much below USD 100, but there
The current SHM driver looks for a sample each polling interval.
The documentation for gpsd suggests using minpoll and maxpoll of 4.
I've fixed the SHM driver to look every second. The refclock
infrastructure already had a FIFO and code to process things
like this. This reduces the jitter signif
Wesley J. Landaker wrote:
> Can anyone give me some suggestions on inexpensive (< $100) OEM GPS
> units that support NMEA and 1PPS for use with NTP? Or any non-GPS
> hardware clock sources that anyone can suggest?
>
> I am already aware of the Garmin GPS 18 LVC, which seems the most
> promising, b
Hello.
After updating from 4.2.0a to 4.2.4p4, I experience some problems getting
the IPv6 interface to work again. It did work with 4.2.0a.
ntpd initializes the interface at startup and then deletes it immediately
afterwards. I tracked the problem down to update_interfaces() in ntp_io.c
where
Steve Kostecke wrote:
> The NTP wiki (i.e. http://support.ntp.org/support) is the logical
> place to start such a list. If for no other reason than the fact that
> everyone is able to contribute their little bit of information.
>
> Of course this requires that someone or, better yet, a group of
>
Hauke,
your observation seem correct. I have no idea why the ifiter code
skips IPv6 interfaces on the second round. There seems to be a bug
there. ifiter must return the complete currently valid interface list or
the interface scanning code will not work correctly.
Have you checked via ifconfig -a
Hal,
Ooop; sorry for the runt that escaped here.
Any work on the Linux kernel to avoid timer interrupts is incompatible
with NTP. This is not a bad or good judgement, just and engineering
constraint. If timer interrupts are disabled, disable NTP.
ON the issue about timer interrupts at frequenc
Hal Murray wrote:
>>>On Linux, a simpler way can be to look at /proc/interrupts - e.g.
>>>(probably Linux-version- and possibly config-specific):
>>>
>>>$ (cat /proc/interrupts; sleep 10; cat /proc/interrupts) | \
>>> awk '/timer/{prev=now; now=$2} END{printf "%dHz\n", int((now-prev)/10)}'
>>
>>Th
Frank Kardel schrieb:
> Have you checked via ifconfig -a that the interface are still listed
> when ifiter fails to enumerate them ?
Yes, the interface state has not changed since the last reboot. It's up and
reachable from the outside.
> Please file a bug at http://bugs.ntp.org. Be sure to in
David L. Mills wrote:
> ON the issue about timer interrupts at frequencies other than 100 Hz,
> this is easy to fix. The nanokernel code that left here uses a constant
> SHIFT_PLL that must be scaled inversely as the timer interrupt
> frequency. It does not need to be exact, but close. I don't
>Although from all the other replies (thanks everyone), it sounds like
>maybe there really just aren't tons of other cheap OEM options.
Your original request wanted a PPS signal. If you don't really
need that, you have a lot more options. There are many low cost
GPS units with USB connections.
Hi Hauke !
Hauke Lampe wrote:
> Frank Kardel schrieb:
...
> I did a bit more research for a bug report.
Thanks for digging into that.
>
> Due to a bug in my debugging output (d'Oh!), ntpd appeared to use
> getifaddrs while in fact it used ifiter_ioctl. As I understand it, glibc's
> getifaddrs(
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