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[mc36 <>]

On 8/23/22 16:51, Tim Chown wrote:
> On 23 Aug 2022, at 15:46, mc36 <> wrote:
> > well, we all know what jitter is, rtt max - rtt min, also in my ping...
>
> Or the average deviation of delays from the average delay.
yeahhh, so these formulas normally should be interchangeable,
that is, if you calculate the stuff in the one way then you should arrive to 
the same result to the other way...

i personally used the mean deviation for the ping because in such a low 
intervals it should not make any difference,
and most notably, it's very easily to calculate from a series of values 
without having to store the whole dataset:

https://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods

the other formulas, well... would require some more memory and cpu to have on 
the routers, but doable.... :)




> > but still, once you have the series of rtt, imho all the others in the 
> > timemap just are a matter of calculation,
> > should be done elsewhere not on the router, or probably it's already doable 
> > in the promsql... frederic!?
>
> Indeed, only the delays are gathered, the rest is calculated off-router.
>
> Tim
>
> > On 8/23/22 16:40, Tim Chown wrote:
> > > Hi,
> > > Here’s a deck from March 2022 about the components used in TimeMap, slide 8 I 
> > > think is most useful:
> > > https://events.geant.org/event/1084/contributions/1022/attachments/672/942/Timemap_Anomaly_Detection_2ndPMW_2022_FFv1.pdf
> > > Calculation of jitter can be a subtle, nuanced thing.
> > > Tim
> > > > On 23 Aug 2022, at 15:33, mc36 <> wrote:
> > > >
> > > >
> > > >
> > > > On 8/23/22 16:23, mc36 wrote:
> > > > > On 8/23/22 16:18, mc36 wrote:
> > > > > > well, doable, and it's a separate class if i recall correctly, that is, 
> > > > > > readily reuseable,
> > > > > > and really not too time comsuming O(n), and i already do so for the ping 
> > > > > > because at that point,
> > > > > > it's useful to have at hand, but heyy, once you have the stream, why would 
> > > > > > one do so???
> > > > > lemme reverb this real quick...
> > > > > so that it's a separate class in freerouter, that is reuseable, but,
> > > > > since it's a calculated value from a series of data,
> > > >
> > > > so let's say we're already exporting the rtt as time series data,
> > > > then to have the deviation from the series is just a matter of calculation...
> > > > you can do it on the router surely, but if you do it elsewhere then you
> > > > must be able to select a time range to calculate the deviation from just 
> > > > those...
> > > >
> > > > the thing is that, it could be a completely different value:
> > > >
> > > > please take a look at the below two pings... i tried to start them at the 
> > > > same time...
> > > > they calculate the deviation obviously the same way, the difference is the 
> > > > time interval,
> > > > 1111 pings: min/avg/max/dev rtt=3/4.0/19/1.0
> > > > 2222 pings: min/avg/max/dev rtt=3/4.0/19/1.2
> > > >
> > > > probably, i had some more bigger responses when it ran twice the time and 
> > > > that's why the mean deviation 1.0 vs 1.2 mean deviation...
> > > >
> > > > br,
> > > > cs
> > > >
> > > >
> > > >
> > > >
> > > > noti#ping www.niif.hu repeat 1111
> > > > info userReader.cmdEnter:userReader.java:1087 command noti#ping www.niif.hu repeat 
> > > > 1111  from local:telnet <loop> 23 -> 127.0.0.1 58682
> > > > 2022-08-23 16:31:17
> > > > resolving www.niif.hu for ipv6 ok!
> > > > pinging 2001:738:0:420::b, src=2001:db8:1101::11, vrf=inet, cnt=1111, len=64, 
> > > > df=false, tim=1000, gap=0, ttl=255, tos=0, sgt=0, flow=0, fill=0, alrt=-1, 
> > > > sweep=false, multi=false
> > > > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!info
> > > >  userReader.cmdEnter:userReader.java:1087 command noti#ping www.niif.hu repeat 2222  
> > > > from local:telnet <loop> 23 -> 127.0.0.1 35006
> > > > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> > > > result=100.0%, recv/sent/lost/err=1111/1111/0/0, took 4603, min/avg/max/dev 
> > > > rtt=3/4.0/19/1.0, ttl 51/51.0/51/0.0, tos 0/0.0/0/0.0
> > > > noti#
> > > >
> > > >
> > > > noti#ping www.niif.hu repeat 2222
> > > > info userReader.cmdEnter:userReader.java:1087 command noti#ping www.niif.hu repeat 
> > > > 2222  from local:telnet <loop> 23 -> 127.0.0.1 35006
> > > > 2022-08-23 16:31:17
> > > > resolving www.niif.hu for ipv6 ok!
> > > > pinging 2001:738:0:420::b, src=2001:db8:1101::11, vrf=inet, cnt=2222, len=64, 
> > > > df=false, tim=1000, gap=0, ttl=255, tos=0, sgt=0, flow=0, fill=0, alrt=-1, 
> > > > sweep=false, multi=false
> > > > !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> > > > result=100.0%, recv/sent/lost/err=2222/2222/0/0, took 9184, min/avg/max/dev 
> > > > rtt=3/4.0/19/1.2, ttl 51/51.0/51/0.0, tos 0/0.0/0/0.0
> > > > noti#