[smokeping-users] Problems with detail graph scaling

Tobias Oetiker tobi at oetiker.ch
Wed May 21 15:54:07 CEST 2008

Hi Dan,
Today Dan Hamilton wrote:

> I had tried increasing unison_tolerance before, but apparently not high
> enough.  I adjusted it much higher and things are better now, but still
> not perfect.  It appears that adjusting it past a certain point is no
> longer having any effect.
> It also seems that the scale used for the 3-hour graph is automatically
> used for the 30-hour and 10-day graphs as well?
> It would seem to me that it would be nice to have a config option that
> would set the max scale on the detail graphs to the highest smoke,
> rather than basing it the median value.

I am looking for ways of making this 'just work' so if you have any
input on a general rule for correct scaling, this would be realy
great ... a switch for this is certainly feadible but it seems a
bit awkward ...

> Also, I still have the problem of the labels on some of the overview
> graphs.  Not catastrophic, but ugly none the less.

this is actually an rrdtool issue ... I have made some feeble
attempts to catch it but I have not succeded yet, the code there is
a bit old and not in my brain cache anymore.


> Thanks for your help.
> -Dan
> David Tomic wrote:
> > That's because of the unison_tolerance setting in your smokeping
> > configuration.
> >
> > http://oss.oetiker.ch/smokeping/doc/smokeping_config.en.html
> >
> > unison_tolerance
> >      if a graph is more than this factor of the median 'max' it drops
> > out of the unison scaling algorithm. A factor of two would mean that any
> > graph with a max either less than half or more than twice the median
> > 'max' will be dropped from unison scaling
> >
> >
> > The 30-hour graph is only showing 'properly', because the spike in your
> > median rtt means that the rest of the smoke doesn't need to be chopped off.
> >
> > Once you zoom in on the 30-hour graph, so that you remove that large
> > spike, then you'll see that it goes back to cutting off the smoke again.
> >
> > If you want to have it so that all the smoke is visible, then you just
> > need to set a [much] higher unison_tolerance setting in your smokeping
> > configuration file.
> >
> >
> > Regards,
> > --David Tomic
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902

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