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SubjectRe: Xircom RealPort versus 3COM 3C3FEM656C
In article <> you wrote:
> On Tue, 22 May 2001 20:10:41 +0100 (BST), Alan Cox <> wrote:

>> Before you give up on the xircom thing, try the -ac kernel and set the box
>> up to use xircom_cb not xircom_tulip_cb
>> That might help a lot

> It doesn't, it still performs poorly with any of the three available
> drivers -- xircom_cb, xircom_tulip_cb, and tulip_cb (from the pcmcia package):

> * Rx gets only about 1.8Mbit/s on a 100Base-TX network with any of the three
> * Tx gets 80+Mb/s with xircom_tulip_cb and tulip_cb, and less than 30Mb/s
> with xircom_cb.

This sounds like a bug I have heard before: some switches don't work with
the xircom card (well, our drivers for it) when doing full duplex.
Could you try the latest driver from

which forces the card to half-duplex?
I manage to get 8Mbyte/sec with it without any problems.

Arjan van de Ven

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