On Tue, 1 Mar 2005 14:29:24 -0500 (EST), linux-os wrote:
> Intel NIC e100 device driver. Two identical machines.
> Private network, no other devices. Connected using a Netgear switch.
> Test data is the same thing sent from memory on one machine
> to a discard server on another, using TCP/IP SOCK_STREAM.
>
> If I set both machines to auto-negotiation OFF and half duplex,
> I get about 9 to 9.5 megabytes/second across the private wire
> network.
>
> If I set one machine to full duplex and the other to half-duplex
> I get 10 to 11 megabytes/second transfer across the network,
> regardless of direction.
>
> If I set both machines to auto-negotiation OFF and full duplex,
> I get 300 to 400 kilobytes/second regardless of the direction.
Might this be related to the broken BicTCP implementations in the 2.6.6+
kernels? A fix was added around 2.6.11-rc3 or 4.
-Paul
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