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From: mike@BRL.ARPA (Mike Muuss)
Newsgroups: comp.protocols.misc
Subject: Re:  Query for best protocol performance on a 10 Mbit/sec ethernet
Message-ID: <8711202206.aa00661@SEM.BRL.ARPA>
Date: Fri, 20-Nov-87 22:06:00 EST
Article-I.D.: SEM.8711202206.aa00661
Posted: Fri Nov 20 22:06:00 1987
Date-Received: Fri, 27-Nov-87 22:22:02 EST
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
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A pair of Sun-3/50 machines running SUNOS 3.3 with tcp_sndspace and 
tcp_rcvspace (or whatever they are called) increased to 16K (ie,
increased offered windows).  Test is typically 1 Mbyte memory to memory
using the TTCP program (copies on request).  Typical data rate is
3 Mbits/sec.  For two pairs, typically see 6 Mbits/sec total for both
connections.  Never bothered to do three pairs.  Trailers were off.

6 Mbits/sec is fairly close to the maximum usable bandwidth of an Ethernet.

On an NSC Hyperchannel, between a Gould PN9080 running UTX 2.0, using a
PI32 to access an A400, with an otherwise idle trunk to an A130 adaptor
connected to a Cray XMP48 running UNICOS 2.0 (at the time), I was able
to achieve 11 Mbits/sec aggregate, using MTU of 4144 and Cray-IP
encapsulation.  This was not using TCP at all, but merely IP/ICMP_Echo
request/response packets, in a "flood ping" test.

	Best,
	 -Mike