Gbps practical performance?

Gbps practical performance?
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Subject Author Date
Gbps practical performance? anders.newsonly 10-11-2007
Posted by on October 11, 2007, 3:36 pm
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Hi all,

>From what I know, the the nature of CSMA/CD limits the practical
performance on a ethernet network. If I remember right I have once
learned that about 60 Mbps is what's possible to expect in reality
from a 100 Mbps ethernet network.

What would the corresponding figure be for a Gbps ethernet network?

Thanks,

Anders


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Posted by glen herrmannsfeldt on October 11, 2007, 5:21 pm
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anders.newsonly@gmail.com wrote:

>>From what I know, the the nature of CSMA/CD limits the practical
> performance on a ethernet network. If I remember right I have once
> learned that about 60 Mbps is what's possible to expect in reality
> from a 100 Mbps ethernet network.

CSMA/CD, along with the required headers and inter-packet-gap
limits it a little, but it should be a lot more than 60Mb/s.

> What would the corresponding figure be for a Gbps ethernet network?

The ability of a host to get data into and out of the NIC,
in addition to disk drive speed and such, is much more significant
for gigabit on current machines.

-- glen


Posted by Rick Jones on October 11, 2007, 6:52 pm
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anders.newsonly@gmail.com wrote:
> Hi all,

> From what I know, the the nature of CSMA/CD limits the practical
> performance on a ethernet network. If I remember right I have once
> learned that about 60 Mbps is what's possible to expect in reality
> from a 100 Mbps ethernet network.

Horsefeathers. I could consistently get 80+ Mbit/s on 100BaseT 90+
even. The only catch was capture effect in half-duplex. And there is
no CSMA/CD or capture effect in full-duplex.

> What would the corresponding figure be for a Gbps ethernet network?

Well, given that gigabit "always" runs full-duplex, what someone else
said about the CPU horsepower and what sort of data (source/sink) one
is trying to push over the net.

rick jones
--
a wide gulf separates "what if" from "if only"
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

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