[mrtg] Re: MaxBytes with multiple cpus and hyperthreading

[Spencer B. Torene]

My experience has been that you need to divide the data by the number of
CPUs that appear in any system performance monitors.  That generally
includes all real and virtual CPUs.  So in your case 6, if I'm
understanding correctly.

If you want to be sure, don't divide by anything, and push the MaxBytes
up in increments of 100 until your graph never flat-lines or tops out
unrealistically.

S

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]
On Behalf Of aux
Sent: Friday, February 17, 2006 1:45 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] MaxBytes with multiple cpus and hyperthreading

Hi, i have many SMP servers (with 4 real CPU's, and 1 real CPU + 1 CPU 
hyperthreading ).

My mrtg.cfg:

[...]
Target[machine]: ssCpuRawUser.0&ssCpuRawUser.0:unipostlectura at 127.0.0.1
+ 
ssCpuRawSystem.0&ssCpuRawSystem.0:unipostlectura at 127.0.0.1 + 
ssCpuRawNice.0&ssCpuRawNice.0:unipostlectura at 127.0.0.1
RouterUptime[machine]: unipostlectura at 127.0.0.1
MaxBytes[machine]: 100
[...]

My question:

What is the value that I must put for maxbytes having several CPU's? 
100?
100 x numbers of cpu ?

The value changes if they are real CPU's or cpus with hyperthreading?

thanks

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