Priscilla, that's a fascinating report - I don't suppose you know of any
more recent work along the same lines?
I was interested to note that maximum throughput happens with two hosts.
Gee whiz! A switch connection :-)
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 27/04/2001
04:12 pm ---------------------------
"Priscilla Oppenheimer" @groupstudy.com on 27/04/2001
11:18:45 am
Please respond to "Priscilla Oppenheimer"
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Re: FastEthernet is up, Line protocol down [7:1828]
At 07:08 PM 4/26/01, Tony van Ree wrote:
>Hi,
>
>True!! Only 100Meg in and 100Meg out but on a 100Meg Half duplex
connection
>at best you get less than 50Meg. You must listen to your own signal
>anything over 50% in one direction is pure rubbish. In reality over 30%
of
>the specified bandwidth you are probably already retransmitting heaps.
And that is pure rubbish. See this URL:
http://www.research.digital.com/wrl/publications/abstracts/88.4.html
>I therefore disagree that there is no significant difference in network
>performance. However, the ability of the server and or the network cards
>ability to pull data off the network and deliver it to the server is a
>different matter. A good example is from back in the old days with an
8bit
>10Meg Half duplex card into a I386 a real speed of 280K was more the
reality.
>
>Just some thoughts.
>
>Teunis,
>Hobart, Tasmania
>Australia
>On Thursday, April 26, 2001 at 03:14:50 PM, David Chandler wrote:
>
> > hey! somebody gets it! Thanks Priscilla:
> >
> > It always bothers me that full-duplex is refereed to as 200 meg. The
> > server folks always think that all their performance issues will go
away
> > when they go to "full-duplex". Sure, no collision, but considering the
> > unbalanced nature of client/server traffic it doesn't make that big of
a
> > throughput difference.
> >
> > I'm surprised that my T1's are not referred to as 3 mbps links. They
are
> > full-duplex too :->
> >
> > DaveC
> >
> > Oppenheimer wrote:
> > >
> > > At 12:23 AM 4/26/01, md. nazri wrote:
> > > >if it's true..that's a good indicator for hardware health
checkup.....
> > > >another Q, if we set the FE to be full-duplex, does it mean we get
>100meg
> > > >for tx and 100meg for rx, so total 200meg for a connection...?
> > >
> > > Each of the two stations on a point-to-point FE full-duplex link get
> > > dedicated 100 Mbps bandwidth for transmitting. One station's transmit
> > > medium is the other's receive medium. Some people call this 200 Mbps.
In
> > > actuality most traffic types don't take advantage of this.
> > >
[snipped]
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