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

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#11

From: Piercarlo Grandi
Date: Mon, 09 Sep 1991 18:33

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On 3 Sep 91 04:56:41 GMT, torek@elf.ee.lbl.gov (Chris Torek) said:

pcg> 32 bit EISA Ethernet cards are an expensive joke, as is any "turbo"
pcg> interface between a 40MB/s 32 bit bus (EISA) and a 0.8MB/s 1 bit
pcg> one (Ethernet).

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

That's impossible to achieve, it ignores inband formatting information
(headers, CRC, pauses between packets) and other practical constraints.

The theoretical maximum is a bit less than 1MB/s, and even that cannot
in practice be achieved because the Ethernet is a simplex channel, and
most protocols require ACKs every now and then, and thus in practice you
cannot just pump data continuously from source to target with maximal
size packets.

The very best Ethernet sw can drive it at 0.8MB/s, sustained, with
occasional bursts at 0.9MB/s.
--
Piercarlo Grandi                   | ARPA: pcg%uk.ac.aber@nsfnet-relay.ac.uk
Dept of CS, UCW Aberystwyth        | UUCP: ...!mcsun!ukc!aber-cs!pcg
Penglais, Aberystwyth SY23 3BZ, UK | INET: pcg@aber.ac.uk

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References: <1991Aug27.192220.20958@world.std.com> <1991Sep1.195029.16374@aber.ac.uk> <17161@dog.ee.lbl.gov>

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From: pcg@aber.ac.uk (Piercarlo Grandi)
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Subject: Re: Need help selecting Ethernet cards for very high throughput rates.
Message-ID: <PCG.91Sep9183332@aberdb.aber.ac.uk>
Date: 9 Sep 91 18:33:32 GMT
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