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From: ljm@OBELIX.TWG.COM
Newsgroups: comp.protocols.tcp-ip
Subject: Re: PC-NFS performance
Message-ID: <9009041717.aa23130@Obelix.TWG.COM>
Date: 5 Sep 90 08:58:36 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 23


>I am working on a system that will require "real-time" data transfer
>from a Sun IPC to a 386 PC-clone (20 or 25 MHz) via Ethernet. For us,
>in this case, "real-time" means 500-1000 byte packets, 10 per second,
>from the Sun to the PC. The PC and Sun will be on a dedicated
>Ethernet, i.e.  *nothing* else on that wire...
>
>Unfortunately, someone has convinced people around here that PC-NFS
>"won't do real-time" and that we must "write our own Ethernet protocol
>stack" to get the performance we need. :-(...

With our *TCP* stack, on a 25 Mhz clone, you can get ~600 1000 byte
packets/second -- with UDP you can melt the wire. Note that this PC
to PC, a SUN (at least with a stock protocol stack) can't keep up.

With this in mind, I would find it very, very difficult to believe
that SUN's PC-NFS will have any trouble at all transmitting just 10
packets/second.

enjoy,
leo j mclaughlin iii
The Wollongong Group
ljm@twg.com