Re: [LARTC] API using cbq / tc ?

[Stef Coene <stef.coene@docum.org>]

On Wednesday 12 February 2003 09:29, devik wrote:
> > > So if you use 5s interval in rrd it seems ok for me (it
> > > is what i plan to do here).
> >
> > If you receive an update each second, you have the feeling it's realtime.
> > It's slow enough to understand the data and it's fast enough to feel it
> > as real-time.  It's also fast enought that you get new data before you
> > are tired to look at the old data.
>
> hmm :) really depends on angle of view .. From my experience
> ("btw" tool) 1sec is too fast because I see results like:
> 30kbit, 28, 10, 33,15,35 .... I can see every packet burst
> and thus my brain is not good enough to compute average from it
> on fly. So I use 10sec moving average to have something senseful.
>
> On other side, there are two time variables :
> - show rate
> - EWMA time constant
>
> I agree that you can have time constant 30sec and
> sampling/show rate 1sec. Then you get smooth and fast
> updates :)
> Still you can use rrd because it is hierarchical - you
> can have last minute in secs resolution, then last hour
> in minutes resolution etc...
Storing the value is no problem, but showing.  If don't think it's such a good 
idea to refresh a webpage and relaod (and draw) the graphs on it each second.  
So rrd for long term overview, java (of VB) for real time overview.

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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