[ntp:questions] Compensating for asymmetric delay on a per-peer/server basis?
tik-tok at bodosom.net
Fri Sep 12 13:06:42 UTC 2014
On Thu, Sep 11, 2014 at 3:50 PM, mike cook <michael.cook at sfr.fr> wrote:
> Yup, AsymmetricDSL does have different up/down bit rates. What I really meant was that the difference would not explain his issue.
> ex: with a 12Mbps down rate and 1.3Mbps up rate, the ratio is around 40usec to 300usec transfer of a 48byte NTP packet.
I was thinking closer to 1ms assuming a 10:1 asymmetry. In any case
it would helpful to know the link speeds, delay and the sign of the
offset i.e. ntpq output from each end might be illuminating. I also
see consistent 2ms offsets between my stratum 1 servers and external
stratum 1 servers. Looking on the latter two I see the same offset
with opposite sign. I have a 30/5 link.
remote refid st t when poll reach delay offset jitter
o127.127.22.0 .GPPS. 0 l 1 8 377 0.000 -0.007 0.008
2610:20:6f15:15 .ACTS. 1 u 111 128 377 35.726 2.098 0.153
2620:cc:8000:80 .GPPS. 1 u 47 64 377 35.532 2.034 0.304
2620:cc:8000:40 .GPPS. 1 u 2 64 377 35.308 2.054 0.675
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