Re: Full/Half duplex - diagnostics not the same as reality

On Thu, 12 Jun 2003, Miskell, Craig wrote:

>(with help from the archives of this list),

Well, it seems that there are still some people that search the archives 
before asking questions. Thank you !!!

There is however one thing that you missed to provide: the driver 
version... But I don't think that it's so important given the results.

> So I'm confused - it seems to be working, but the diagnostics indicate
> otherwise unless I force the setting using mii-diag.  

I think that you didn't pay enough attention to all the output. See this:

>    IEEE 802.3 CSMA/CD protocol. Link partner capability is 0080: 
> 100baseTx.
>    Negotiation did not complete.

It does say that negotiation did not complete... And does not say anything 
about the partner being able of FD, although you know that it should be 
forced to FD. So it's clear that the card didn't see the switch port 
properly.

Please read this very recent message (any maybe the whole thread) on a 
very related topic:

http://www.scyld.com/pipermail/vortex/2003-June/002453.html

> Is it possible that it's not really running full-duplex but that
> something else in that stops the collisions?

After you issued the 'mii-diag -F' command, it should run FD; "-F" forces 
that mode and disables autonegotiation. Also keep in mind that FD cannot 
have collisions by definition.

-- 
Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: [email protected]


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