[smokeping-users] Graph scale problem

[Tobias Oetiker]

Hi Ged,

The reason the 'spike' is lower in the last 10 day graph is that a
single pixle there represents more data than in the higher
resolution graphs ... the net result is, that the spike becomes
lower as it gets distributed across time ...

cheers
tobi

Today G.W. Haywood wrote:

> Hi there,
>
> Unfortunately, although I've subscribed and received a welcome message
> from the list server, the mail from the list isn't reaching me yet.  I
> don't know why but I'm investigating.  In the meantime, please forgive
> me if you use a thread-capable mail-reader and this thread is broken.
>
> On Fri, 25 April 2008 David Tomic wrote:
>
> > Bryan K. Hess wrote:
> > >
> > > ...I noticed a message in the list archives ... same problem...
> > > It seems that for some detail graphs, the smoke portion of the
> > > graph has different peaks than in other views for the same time
> > > and data(!).
> >
> > This is because of the 'unison_tolerance' setting in your smokeping
> > configuration file.
>
> I think the problem is worse than just the 'smoke'.  Since first
> installing smokeping a week ago, on many occasions I've seen graphs
> where the highest median RTT is different for the same periods on
> different graphs.  I understand the difficulty of showing data with a
> large dynamic range on a single graph with clarity, but since this is
> exactly the sort of thing that we're looking for I'd call this a bug.
>
> http://www.jubileegroup.co.uk/JOS/misc/scales_oddity.gif
>
> Maybe graphs should default to a logarithmic scale?
>
> --
>
> 73,
> Ged.
>
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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