On Tue, Dec 31, 2002 at 01:20:14AM -0500, Matthew N. Dodd wrote:

> This doesn't mean that the 3c589D will support Full-Duplex.
> 
> I suspect that the windows driver offers that option (since it is probably
> for whole family of cards) and doesn't do anything if the card doesn't
> support it.
> 
> Its likely that the 'fxp' card under windows is doing NWAY regardless of
> control panel settings.  Since the reported config is a cross-over
> environment there isn't any way to tell for sure that windows runs the
> 589D in full duplex mode.

Well, I guess there is a way. I did one more thing.

I booted my desktop with Intel card into FreeBSD and commanded

# ifconfig fxp0 media 10baseT/UTP mediaopt full-duplex

Then I booted the noteboot into Win95 with full duplex enabled on 3com card.
I started FTP transfer from FreeBSD to Win95 and got 500KBps.
Then I commanded

# ifconfig fxp0 media 10baseT/UTP

and ran transfer again. I got only 10-13KBps then.
Then I changed 3com to half duplex, Windows rebooted and I got
another 500KBps FTP tranfser, while fxp0 is still in half duplex mode.
Then I commanded again:

# ifconfig fxp0 media 10baseT/UTP mediaopt full-duplex

And now I see only 40KBps.

I think it shows duplex mismatch. I believe fxp(4) set duplex correctly,
so it must be that 3c589D changes duplex really.

Eugene Grosbein

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