from desktop Pinging 192.168.1.105 with 32 bytes of data: Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 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192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Reply from 192.168.1.105: bytes=32 time<1ms TTL=128 Ping statistics for 192.168.1.105: Packets: Sent = 100, Received = 100, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\Users\xenot>ping -n 100 192.168.1.130 Pinging 192.168.1.130 with 32 bytes of data: Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=5ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=5ms TTL=128 Reply from 192.168.1.130: bytes=32 time=6ms TTL=128 Reply from 192.168.1.130: bytes=32 time=6ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=6ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=8ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=3ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Reply from 192.168.1.130: bytes=32 time=4ms TTL=128 Ping statistics for 192.168.1.130: Packets: Sent = 100, Received = 100, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 3ms, Maximum = 8ms, Average = 3ms On Sun, Nov 26, 2017 at 1:25 AM Caleb Cushing wrote: > ping from laptop > > C:\Users\xeno>ping 192.168.1.105 -n 100 > > Pinging 192.168.1.105 with 32 bytes of data: > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=5ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=4ms TTL=128 > Reply from 192.168.1.105: bytes=32 time=3ms TTL=128 > > Ping statistics for 192.168.1.105: > Packets: Sent = 100, Received = 100, Lost = 0 (0% loss), > Approximate round trip times in milli-seconds: > Minimum = 3ms, Maximum = 5ms, Average = 3ms > > > On Fri, Nov 24, 2017 at 3:35 AM Neil Davies wrote: > >> On 24 Nov 2017, at 09:20, Hal Murray wrote: >> >> >> neil.davies@pnsol.com said: >> >> There are a few more issues - the relative drift between the two clocks >> can be as high as 200ppm, though typically 50-75ppm is what we observe, >> but >> this drift is monotonic. >> >> >> 200 ppm seems pretty high, but not off scale. If ntpd is running and not >> getting confused by long queuing delays, it should correct the drift to >> well >> under 1 ppm. If you turn on loopstats, you can graph it. >> >> >> I’m saying that is the maximum rate of drift between two clocks even >> when they are under NTP control. As you say below the clock rates >> are not completely stable they are temperature dependent. >> When we did this with the guys at CERN we could >> correlate the results with the workload (see below for references). >> >> We’ve got ~1M experiments using this approach across various networks, >> the numbers are what we are seeing in practice. >> >> The caveat is that, after a while (i.e several 100s) the clock drift can >> make >> a significant difference (i.e a few ms) in the one-way delay estimation. >> >> >> If you are blasting the network and adding long queuing delays, ntpd can >> easily get confused. >> >> There is another quirk to keep in mind. The temperature coefficient of >> the >> crystal is ballpark of 1 ppm per C. Things can change significantly if >> an >> idle system starts flinging lots of bits around. >> >> >> Also NTP can make changes at one (or both) ends - they show up as distinct >> direction changes in the drift. >> >> >> I'm not sure what you mean by "direction change". I'd expect a graph of >> the >> time offset vs time to be linear and the slope would have a sharp change >> if >> ntpd changed it's "drift" correction and/or maybe a rounded bend as a >> system >> warmed up. >> >> >> Don’t forget you are measuring the difference in the rates between two >> NTP clocks, >> hence the change when one of the NTP systems decides to change the drift >> rate >> the relative rate can change direction. >> >> >> ---------- >> >> Are you happy with whatever you are doing? Should we try to set things >> up >> >> so ntpd works well enough? How close would you like the times to be? … >> >> >> Yep, we’re very happy - we don’t care that there is a linear clock drift >> (we >> can correct for that) and the step changes are infrequent and can be >> eliminated >> from the long term analysis. >> >> You might find §4.4 (esp §4.4.5) and §5.6 in >> https://cds.cern.ch/record/1504817/files/CERN-THESIS-2013-004.pdf >> interesting. It illustrates these sort of issues. >> >> >> >> >> >> -- >> These are my opinions. I hate spam. >> >> >> >> >> _______________________________________________ >> Bloat mailing list >> Bloat@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/bloat >> > -- > Caleb Cushing > > http://xenoterracide.com > -- Caleb Cushing http://xenoterracide.com