[mrtg] Re: MaxBytes

[nate]

Barbeau Roger said:
> Hi!
> On setting in MRTG look strange for me:
>
> MaxBytes[10.6.2.2_1]: 12500000
>
> Ethernet 10 mb = 1250000
> Ethernet 100 mb = 12500000
> Why does MRTG set the :
> <TR><TD>Max Speed:</TD>  <TD>12.5 MBytes/s</TD></TR>
> To 12.5 mb?
> Usually a 10 mb network should have real speed of 4 to 6 mb
> So why not 40 to 60 mb on a 100 mb network????

because if you have good cables, NICs, switches & operating systems you
can come real close to the 12.5MByte/second limit @ 100Mbit. I often
see 8-9MB/s transfers on my network, and once or twice while testing I
mangaged to get about 11.5-11.8MB/s with ftp.

though these are always burst transfers, only a few dozen megs at a time
usually, not sustained for any length of time. With higher end systems
they could sustain such a rate. testing my local LAN now, with wget on
a 40MB file, wget says:

14:01:33 (10.31 MB/s) - `file.mpg' saved [39096652/39096652]

and that is going over NFS

NFS file-> web server -> web client -> local file

transferring a much larger file from the same server(though not
originating on NFS, wget says:

14:04:52 (8.90 MB/s) - `filename.iso' saved [610879488/610879488]

(much of the time was 9.0-10.5MB/s)

both systems are linux 2.2.19, with good cables connected to each other
by a extreme networks summit 48 switch(~18Gbps backplane).


nate



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