[ntp:questions] ntpd -d and ntpd -D X
david at ex.djwhome.demon.co.uk.invalid
Sun Mar 15 11:10:36 UTC 2009
Varrun Ashok wrote:
> Hello everybody, I have checked if ntpd is working in my BusyBox OS using
> ntpq -p and a few oher daemons. I went through the website www.ntp.org for a
> detailed documentatin on ntpd -d and ntpd -D X commands but could not find
That's normal. For open source one is expected to use the source code
as the reference. For closed source code, one is expected to supply the
results to the support person without understanding them. Requiring
detailed, end user, documentation for debugging output is generally seen
as too much of an imposition on the coder, for open source, and as
providing too much proprietary information, for proprietary code.
> any.My ntp accepts pps and synchronises time every 16 secs.There are a lot of
ntpd does not synchronise time every n seconds. It provides information
to the kernel that micro-adjusts the time rather more frequently than
this. It normally works in terms of adjusting frequency, rather than
directly in terms of phase corrections.
> key words used in the output ntpd -d and ntpd -D 3 and i would like to know
> what each word means.Even google search did not yield great results. I
> have been using 1 GHz P3 SBC. Soon I will shift to PXA270 ARM core SBC which
> runs at 512 MHz. Do the two daemons ntpd and ntpq depend on speed of
ntpq is not a daemon.
> processor. Are there any other processor dependencies. Please mail me the
> appropriate links.
ntpd doesn't need a lot of processor power. It has chip set
dependencies, rather than processor dependencies. For Linux or FreeBSD,
these are generally within the kernel support for ntpd, rather than ntpd
itself. The one possible processor dependency is that recent Intel
architecture devices have a RDTSC instruction, to read a count of
machine cycles, which might not exist for ARM, or might not be supported
by the kernel software clock code for ARM.
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