Hello again Tobi, On Mon, 28 Apr 2008, G.W. Haywood wrote:
> On Sat, 26 Apr 2008, Tobias Oetiker wrote: > > G.W. Haywood wrote: > > > > > http://www.jubileegroup.co.uk/JOS/misc/scales_oddity.gif > > > > > > Maybe graphs should default to a logarithmic scale? > > > > 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 ... > > With the result that the graphs give a very misleading impression of > the data under certain circumstances. > > ... you've made some changes in the latest version ... I'll have > a look at it before commenting further. The 'smoke' rising to the top of the graphs is an improvement. I'm now using logarithmic graphs but I'm still having difficulties with the scales. http://www.jubileegroup.co.uk/JOS/misc/WRT54GS4_logarithmic_graph.gif http://www.jubileegroup.co.uk/JOS/misc/tornado_logarithmic_graph.gif http://www.jubileegroup.co.uk/JOS/misc/webserver_logarithmic_graph.gif As you can see a minimum RTT on the logarithmic graphs of 100us gives rather silly results if the typical RTT is 30us... The range selection algorithm seems not to take (much?) into account deviations of RTT substantially above the norm. The results resemble a hedgehog after mowing the lawn. Possibly the graph parameters need to be individually configurable for each (probe,target) pair. FWIW my preference would probably be for manual configuration, at least of the graph range limits. My logic is that a particular network path will typically have a 'normal' performance. Large excursions from normal will be of most interest, while smaller fluctuations will tend to be ignored. I'm thinking that I would be quite happy with a fixed upper bound on the logarithmic graphs of ca. one second, and a lower bound which varies by factors of say 10e+0.5 from 10us to 100ms. Obviously anyone making ssh connections over a satellite link would want to say something about that. :) I'll tweak the code and see how it goes. Having griped more than enough about relatively easily fixed things like the graph scales I think I ought to thank you for all the hard work you've done to make SmokePing such a tremendously useful tool! -- 73, Ged. _______________________________________________ smokeping-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/smokeping-users
