unruh wrote:
On 2011-11-10, balaji u <[email protected]> wrote:
my device is connected with a NTP server(stratum 5), which shows round-
trip delay with its primary reference (stratum 3 server) as 550 to 720
msec and dispersion as 70 to 160.
That is pretty huge. How is it connecting? pony express? Why are you
using such a bad server? (720ms is enough time for the signal to circle
the earth 5 times. Or I guess if it uses a sattelite as part of the link
it could generate delays like that)
Whether this could be a problem for my NTP client?. The question
Since ntpd jumps if the time gets out by 128 ms, your delay is getting
to the point where successive timings could have offsets of that order.
And ntpd doing jumps a fair amount of the time is not a good idea.
arises because my NTP server is sending packets with its Root delay
and Root Dispersion values which could create some problem on the NTP
client side.
Why are you using such a bad server for your server? Buy a gps receiver
and get usec accuracy for your server and then you can stop worrying.
Or find some better servers to serve your server.
I use mobile broadband and have seen latencies of several seconds
when the link has been idle. When the link is loaded the lowest
latencies have been about 150ms. That's why I joined the pool so
that I could use burst against my own server without worrying.
Ntp seems to get my netbook within a few milliseconds.
The valleys here have steep sides and tops are about 300m above
the road. Even mobile broadband isn't always accessible.
David
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