I was able to achieve ~320 Mbit/sec data rate using the Gigabit System Reference Design (GSRD XAPP535/536) from Xilinx. This utilizes the LocalLink TEMAC to perform the transfers. The reference design provides the Linux 2.4 drivers that can be ported to Linux 2.6 with a little effort.
This implementation did not use checksum offloading and the data rates were achieved using TCP_STREAM on netperf. Greg
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