After switching to the Monta Vista 3.1 Kernel, my 10/100 ethernet performance diminished. What caused this issue?
This problem has been fixed in the latest EDK 8.1i Service Pack available at:
<http://www.xilinx.com/xlnx/xil_sw_updates_home.jsp>
The first service pack containing the fix is EDK 8.1i Service Pack 1.