On Mon, Apr 29, 2002 at 08:08:02PM +0300, Danny Braniss wrote:

> at 100baseTX <full-duplex> is slower than 10Mgb :-(

Same problem here with the xl0 driver. My 3Com 3c905C-TX Fast
Etherlink XL connects to a Cisco Micro Switch (1548, unmanaged).
According to the lights on the back of the switch everything runs
at 100 Mbits full-duplex initially (that is after a reboot).
However after a while the switch indicates that it is running at
100 Mbits half-duplex. I don't know what causes it, but this is
happening for at least a month.

When this happens 'ifconfig -a' will still report that everything
is running at 100 Mbits full-duplex. Judging from the performance
and what the Cisco switch indicates this is not true, it is
running half-duplex!

Unfortunately the switch is unmanaged hence I am not able to
explicitely set the switch to 100 Mbits full-duplex. Using
ifconfig to set the nic to 10baseT/UTP and then back to 100baseTX
full-duplex doesn't help. Only a reboot will bring the NIC back
to 100 Mbits full duplex mode.


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