[ntp:questions] Tiime Sync solution

John Pettitt jpp at cloudview.com
Tue May 31 19:08:32 UTC 2005


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Adrian 'Dagurashibanipal' von Bidder wrote:
> Clinging to sanity, Brad Knowles mumbled in his beard:

>>>relatively slow ADSL line, I'm usually down in the low single-digit 
>>>*microsecond* region.
> 
> 
> You sure?
> 
>     remote       refid     st t when poll reach   delay   offset jitter
> ==========================================================================
> +130.60.75.75 130.149.17.8  2 u   85 1024  377   20.503    1.772   0.429
> *130.60.75.72 130.149.17.8  2 u   26 1024  377   23.294    2.103   0.415
> +130.60.7.44  130.60.7.51   3 u  121 1024  377   19.054   -7.424   0.390
>  192.168.1.17 192.168.1.254 4 u   84 1024  377    0.627   -2.502   0.860
> 
> (and offset=-1.94 in ntpq -c rv)
> 
> I was quite sure that these numbers are ms and not µs - are you really
> down at 0.00x here?

I'm getting low 100's of microseconds locally and between 300-500
microseconds accross a DSL link

jeeves# ntpq
ntpq> pe
    remote           refid    st t when poll reach delay offset jitter
==========================================================================
*GPS_NMEA(0)     .GPS.          0 l   19   64  377  0.000  0.046 0.038
- -solar.localnet  192.168.2.254  2 u    2  256  377  0.678 -0.153 0.504
+gatekeeper.no-s .GPS.          1 u  241  256  377  0.840  0.045 0.925
+john-desk-2.loc 192.168.2.254  2 u   25  256  377  0.335  0.198 0.579
- -skipjack.no-suc 64.142.103.194 2 u    1  256  377 11.669  0.293 6.094
 LOCAL(0)        73.78.73.84    5 l   27   64  377  0.000  0.000 0.002
ntpq>

gatekeepr and solar are soekris 4801's - slow 586 class FreeBSD boxes.
 john-desk-2 is a windows box on a gigabit land connection to jeeves
(the server).   skipjack lives in a server farm but still manages to
track the refclocks pretty well. This snapshot while a backup was
running which is why the server is 48 us away from the refclock.

Now if I could only figure out why two identical 4801''s on the same
switch have 160 us difference in round trip time ....

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