[smokeping-users] Re: 0.99.9 is out

Tobias Oetiker oetiker at ee.ethz.ch
Fri Jan 18 23:09:47 MET 2002

Today Paul C. Williamson wrote:

> Folks,
> In some instances, I have previews where no numbers are show.  There
> are other previews where the number show is the last whole "tick" on the
> graph.  For example, I have two routers where one of them shows 100 m,
> but the red line is slightly above.  Going into the detail for the graph shows
> that the average is 109.1 ms.  In the device right below, there are no numbers
> shown, and the average is 86.6.  I would have expect an 80 m to appear, but no such luck.  I thought the "unison_tolerance" would have shown these
> two graphs similar.  In other words, even though the one has an average
> response of 86.6, it would show the same upper limit (100 m), but just
> have drawn the red line lower in the graph.  Make sense?
> At the very least, it should show 80 m in the preview, which it does not.
> Is this correct?

the algorithm as it is being used now works in the following way:

1) build the avearage median for all graphs on the page
2) order them by size, and pick the middle one
3) build a group of all medians which are within either unison_tolerance
   times larger or smaller than the chosen middle median.
4) the graphs are as high as necessary to show the largest of the
   medians in this group. The other members of the group are scaled

one problem which remains is that currently we use the lazy update
algorithm, this means, that when there is a change in the setup,
not all graphs will be redrawn. I will implement a fix for this by
storing the max for each graph separately in order to know when it
has to be redrawn because the scaling has changed ...

all confused ?


> Paul
> >>> Tobias Oetiker <oetiker at ee.ethz.ch> 01/16/02 06:03PM >>>
> Folks,
> I have implemented a logarithmic and a unison_tolerance variable
> ...
> the new release is available on
> people.ee.ethz.ch/~oetiker/webtools/smokeping/pub
> tobi

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