Re: Need help selecting Ethernet cards for very high throughput rates.

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#15545

From: Craig Partridge
Date: Tue, 10 Sep 1991 07:38

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In <17380@dog.ee.lbl.gov> torek@elf.ee.lbl.gov (Chris Torek) writes:

>>torek> Actually, Ethernet is 1.25 MB/s (10 over 8 = 1.25, not 0.8).

>In article <PCG.91Sep9183332@aberdb.aber.ac.uk> pcg@aber.ac.uk
>(Piercarlo Grandi) writes:
>>That's impossible to achieve, it ignores inband formatting information
>>(headers, CRC, pauses between packets) and other practical constraints.

Just following up Chris' reposting of Van's note.  If Van's note fails
to convince, one should read the paper by Boggs, Mogul and Kent in the
Proceedings of SIGCOMM '88.  They walk through the various models of
Ethernet and show that simplifying assumptions in some models cause
the models to understate the maximum bandwidth.  Also, they did some
real tests of bandwidth with various configurations of senders and
receivers that show the throughput rates.  My recollection is that
they showed a maximum practical rate (after headers et. al.) of a little
over 1 MByte/s.

Craig Partridge

PS: Yes, Boggs is Dave Boggs, of Metcalfe and Boggs, the Ethernet designers.

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<1991Aug27.192220.20958@world.std.com> <1991Sep1.195029.16374@aber.ac.uk> <17161@dog.ee.lbl.gov> <PCG.91Sep9183332@aberdb.aber.ac.uk> <17380@dog.ee.lbl.gov>

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From: craig@sics.se (Craig Partridge)
Newsgroups: comp.protocols.tcp-ip,comp.protocols.tcp-ip.ibmpc,biz.sco.general,comp.unix.sysv386,comp.unix.wizards
Subject: Re: Need help selecting Ethernet cards for very high throughput rates.
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Date: 10 Sep 91 07:38:58 GMT
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