This is probably not an e1000 problem, but a general Ethernet "feature". If
you defeat auto-negotiation to force the data rate, you implicitly defeat
duplex negotiation as well. You need to explicitly set the duplex mode.
In full duplex mode, send and receive are are fully independent, and packets
can flow concurrently in both directions.
In half duplex mode the receiver assumes it is hearing its own transmission,
and ignores (or errors) frames that are partially overlapped by it's
own transmission.
See for example: S. Shalunov and R. Carlson. "Detecting Duplex Mismatch on
Ethernet"
http://www.springerlink.com/content/vapet12x584e6wyn/
Best regards,
--MM--
On Tue, 4 Dec 2007, Lukas Hejtmanek wrote:
Another problem at my own machine. If I force speed to 100Mb on 1GE network,
I can reach 95Mbps bidirectional using UDP (0.34% loses) but only 1.2Mbps
using TCP. A bug? If I enable autonegotiation and run at 1GE, I can got 95Mb
on TCP to the target machine (the target machine has only 100Mb connection).
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