Utilization of Ethernet links

Utilization of Ethernet links

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Subject Author Date
Utilization of Ethernet links ChamaraG 09-12-2006
Posted by ChamaraG on September 12, 2006, 11:39 am
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Hello All,
I am interested in any studies regarding utilization of Ethernet links,
specially first level links from hosts to edge switches. To the best of
my knowledge, the only studies are the 1998 and 2003 studies by Odlyzko
and the 2005 study by Pang, et al presented at IMC 2005. These studies
show that typical utilization over a time period of one hour or more is
around 1% or less.

Are there any other studies regarding utilization of Ethernet links
that you are aware of? Especially any that show higher levels of
utilization than mentioned above?

Thanks!

Chamara Gunaratne


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Posted by phn on September 12, 2006, 5:13 pm
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ChamaraG wrote:
> Hello All,
> I am interested in any studies regarding utilization of Ethernet links,
> specially first level links from hosts to edge switches. To the best of
> my knowledge, the only studies are the 1998 and 2003 studies by Odlyzko
> and the 2005 study by Pang, et al presented at IMC 2005. These studies
> show that typical utilization over a time period of one hour or more is
> around 1% or less.
>
> Are there any other studies regarding utilization of Ethernet links
> that you are aware of? Especially any that show higher levels of
> utilization than mentioned above?
>
> Thanks!
>
> Chamara Gunaratne

You could start by studying your own LAN.

If you ask if someone has experienced higher utilization ? Answer yes.

Any side-effects ? Only effects you could expect from any media, peak
loads
may cause retransmissions and/or throttling from higher levels.


Posted by ChamaraG on September 12, 2006, 8:06 pm
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Thanks for the reply. Yes, I did measure the utilization in my LAN. And
what I observed was a maximum utilization of 4% (100 Mb/s link) over 30
minutes.

There is always peak loads that last for a few seconds or minutes (ex:
backups). I am more interested in utilization or network load over
longer time periods like 10's of minutes.

Thanks!

phn wrote:
> ChamaraG wrote:
> > Hello All,
> > I am interested in any studies regarding utilization of Ethernet links,
> > specially first level links from hosts to edge switches. To the best of
> > my knowledge, the only studies are the 1998 and 2003 studies by Odlyzko
> > and the 2005 study by Pang, et al presented at IMC 2005. These studies
> > show that typical utilization over a time period of one hour or more is
> > around 1% or less.
> >
> > Are there any other studies regarding utilization of Ethernet links
> > that you are aware of? Especially any that show higher levels of
> > utilization than mentioned above?
> >
> > Thanks!
> >
> > Chamara Gunaratne
>
> You could start by studying your own LAN.
>
> If you ask if someone has experienced higher utilization ? Answer yes.
>
> Any side-effects ? Only effects you could expect from any media, peak
> loads
> may cause retransmissions and/or throttling from higher levels.


Posted by Robert Redelmeier on September 13, 2006, 8:56 am
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> I am interested in any studies regarding utilization of
> Ethernet links, specially first level links from hosts to
> edge switches. To the best of my knowledge, the only studies
> are the 1998 and 2003 studies by Odlyzko and the 2005 study
> by Pang, et al presented at IMC 2005. These studies show
> that typical utilization over a time period of one hour or
> more is around 1% or less.

> Are there any other studies regarding utilization of Ethernet
> links that you are aware of? Especially any that show higher
> levels of utilization than mentioned above?

It is fairly easy to synthetically generate high network loads
using utilities such as `ttcp`. These are really only good for
testing and observing breakdown behaviour.

Rich might correct me, but AFAIK, Ethernet was never intended
to run loaded. The idea was to throw massive bandwidth at
the devices so simple arbitration systems like CDMSA could be
used rather than token schemes.

Where users perceive "the network is slow", the usual problem
_isn't_ ethernet bandwidth or utilization but:

1) Overloaded end devices (file servers) or gateways (watch
for TCP capture effect on asymmetric links).

2) Broken hardware/cabling [split pairs] causing bit errors,
timeouts and retransmits.

3) Broken software with excessive reliance on broadcast [NetBEUI].


Otherwise, take those moderate load studies as representative
of typical practice. If you must, you could model the load
variability [Poisson?] and extrapolate.

-- Robert




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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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