[ntp:questions] Garmin 18 LVC: whether to fudge

Uwe Klein uwe_klein_habertwedt at t-online.de
Thu Feb 12 10:45:44 UTC 2009


Unruh wrote:
> If there is a 2ms delay is processing the interrupt, throw away your system
> and buy a new one. It is severely damaged. 
> 
> 
I have fought with ntpd over an asymmetric congested ISDN line a year or two ago.

rather dumb test and it does not even expose asymmetries, but:

ISDN basic rate, no other traffic:
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=1 ttl=249 time=47.7 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=2 ttl=249 time=47.7 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=3 ttl=249 time=48.0 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=4 ttl=249 time=47.4 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=5 ttl=249 time=47.6 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=6 ttl=249 time=47.6 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=7 ttl=249 time=47.7 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=8 ttl=249 time=47.8 ms
64 bytes from mx01.versatel.de (212.7.146.1): icmp_seq=9 ttl=249 time=47.9 ms

DSL nominaly 1.5MB/s, speed optimised, used as (at that moment)
	low utilised internet access:
PING www.versatel.de (82.140.32.137) 56(84) bytes of data.
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=1 ttl=249 time=47.7 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=2 ttl=249 time=57.2 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=3 ttl=249 time=50.1 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=4 ttl=249 time=104 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=5 ttl=249 time=48.3 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=6 ttl=249 time=49.0 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=7 ttl=249 time=48.5 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=8 ttl=249 time=49.0 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=9 ttl=249 time=49.0 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=10 ttl=249 time=49.5 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=11 ttl=249 time=83.0 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=12 ttl=249 time=48.2 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=13 ttl=249 time=49.2 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=14 ttl=249 time=49.2 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=15 ttl=249 time=49.7 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=16 ttl=249 time=57.8 ms
64 bytes from www.versatel.de (82.140.32.137): icmp_seq=17 ttl=249 time=49.6 ms

uwe




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