[smokeping-users] Re: Get jitter

[Franklin Vergara TEC]

Ok,  but  is there form to quantify the value of jitter.??  Or median
value 
the jitter ..??


Ing Franklin Vergara
Jefe Tecnico Regional Quito
Grupo TVCable

-----Mensaje original-----
De: hkclark at yahoo.com [mailto:hkclark at yahoo.com] 
Enviado el: Martes, 18 de Enero de 2005 16:16
Para: Franklin Vergara TEC; smokeping-users at list.ee.ethz.ch
Asunto: Re: [smokeping-users] Re: Get jitter

Hi Franklin,

Yep -- you got it.  

If you notice, Tobi is sorting the 20 pings that FPing
does every 300 seconds (using defaults) by the latency
values (with unknown values pushed to the top and
bottom).  The "colored line/dot" is the median value
with the smoke showing the distribution of latency
(IOW, jitter) above and below that median.  IOW, more
smoke = more jitter (variation in latency).

HTH,
Kennedy 

--- Franklin Vergara TEC <fvergara at tvcable.com.ec>
wrote:

> 
> Thanks Kennedy, I have another question, in the
> graph what is the
> meaning 
> the gray bars ..??   is the jitter ..??
> 
> 
> Ing Franklin Vergara
> Jefe Tecnico Regional Quito
> Grupo TVCable
> 
> -----Mensaje original-----
> De: hkclark at yahoo.com [mailto:hkclark at yahoo.com] 
> Enviado el: Viernes, 14 de Enero de 2005 17:17
> Para: Franklin Vergara TEC;
> smokeping-users at list.ee.ethz.ch
> Asunto: Re: [smokeping-users] Get jitter
> 
> You might have good enough links that there isn't
> enough jitter (smoke) to actually show up.  You
> could
> do an:
> 
> rrdtool dump <filename.rrd> > filename.xml
> 
> and view the raw data (smokeping logging can also be
> enabled to get similar numbers).  If you haven't
> worked with XML and RRDTool before, it can take a
> little while to get your bearings, but it should be
> obvious enough to tell if all the values are really
> close together (meaning you don't have much jitter).
> 
> You could also experiment with SmokePinging "other
> stuff" on the Internet until you find something that
> shows some smoke.
> 
> HTH,
> Kennedy
> 
> --- Franklin Vergara TEC <fvergara at tvcable.com.ec>
> wrote:
> 
> > Hello, I am used smokeping with Fping module, but
> i
> > don't have the
> > jitter in the graph. 
> > How I obtain this value
> >  



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