[mrtg] Re: drops in graph when summation

Pavel Ruzicka pavouk at k332.feld.cvut.cz
Sun Jul 28 23:48:01 MEST 2002


> > when I use summation for 3 STM-1 lines, I will get drops about 40Mbps in daily
> > graph periodicly every 2 hours.
> > When I look at independent graphs, there are not drops.
> > I use SNMPv2c, 64bit counters for measuring, MRTG2.9.17 with RRDTool.
> After MRTG has run, look at the first line of the logfile.  Do this
> a couple of times.  With this information it becomes clear if it is
> mrtg or rateup doing things different from what you expect.

I don't use rateup, I use MRTG with RRDTool.

> However, you write about 40 Mbps and this is nowhere near 114.5 Mbps.
> Or do you perhaps mean the rate seems to drop by 40 Mbps ?  In that
> case the real summed rate would be 114.5 Mbps higher than what's
> visible in the graph.

I have rate about 300Mbps with drops about 40Mbps.
I use 64bit counters with ":::::2" in TARGET.
I know about 114Mbps problem, but with 64bit counters, when I measure
1 Gb Ethernet it is OK.
Problem is only with SUMMARIZED interfaces.

Same interfaces measured independently are good without drops.

Best regards,

Pavel Ruzicka

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