Never force full duplex.

[Cy]

Yep, that's the way I'll go from now on.  The more years I get under my belt
the less I try to understand things like NWay.  So what I find myself doing
more and more is finding something that works and sticking with it.  It's
just too tiring to try and understand it all.  B-)

Actually, you've said this before if I'm not mistaken.  When I was playing
around with the new card, I was searching some list archives somewhere and
found almost the exact same message as below.  But, did I listen?  Naw, of
course not.  Sure wish I would've though.  I would be several hours ahead
with other projects.  B-)

Leland

----- Original Message -----
From: "Donald Becker" <becker@scyld.com>
To: <linux-tulip@beowulf.org>
Sent: Friday, March 31, 2000 10:42 AM
Subject: Never force full duplex.


On Fri, 31 Mar 2000, Cy wrote:

> I too had problems with crossovers, except that I was attempting to force
> full duplex.  Could never get it to work.  I just let autonegotiation take
> care of itself and I get full duplex like I wanted.

This is common enough that it is worth repeating:

      Never force full duplex.
      Never.  No, not then.  No, it's not a secret go-faster flag.

There is only one place where forcing full duplex is needed, and that is
when you are talking to an old or misdesigned switch that doesn't have
autonegotiation, and you cannot change the switch configuration.  If you can
change the switch configuration, change it back to half duplex and save
yourself future headaches.  You probably don't see any significant
performance improvement when using full duplex on switches without working
autonegotiation anyway.

Read
  http://cesdis.gsfc.nasa.gov/linux/misc/NWay.html
for more info on N-Way autonegotiation.

Donald Becker
Scyld Computing Corporation, becker@scyld.com

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