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To: hutton@isi.edu
cc: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE>,
        hackers@FreeBSD.ORG
Subject: Re: throughtput measurements for fast ethernet 
In-reply-to: Your message of "Fri, 16 May 1997 08:56:09 PDT."
             <199705161557.AA13608@zephyr.isi.edu> 
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Date: Fri, 16 May 1997 10:09:58 -0700
From: "Russell L. Carter" <rcarter@consys.com>
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> 
> > > has anyone got UDP/TCP throughtput figures on FreeBSD for fast ethernet 
> > > cards...specifically the 3com and Intel Ether Express cards.
> > 
> > Someone told me some time ago when I was seeking for similar
> > figures (Garret ?) that FreeBSD can saturate 10/100 Mbit with appropriate
> > CPU power. The only interesting question would be CPU utilization during
> > transfer compared to other L-word OSs.
> > 
> 
> 
> I was hoping for something more specific. My _first_ tests with the 3com vx 
> driver for the 395 pci card on FreeBSD 2.2.1 are not showing good results - 
> highest throughput for UDP 45Mbps. I should stress that these were first tests.
> 
> Has anyone any traffic measurements for any of the fast ethernet drivers?

What kind of main memory bandwidth can your motherboards sustain?  A
good test is the stream benchmark from McCalpin.  Many P6 motherboards
can sustain transfer rates which drive 100mb ethernet at full throttle,
but a lot of P5 motherboards cannot.  45Mbps is not unusual for these.

Russell