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[Tim Chown <>]

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.

> 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#
>>>