I don't know what the bottleneck is. What I'm seeing is ~60Mbps transmit
speed and anywhere from 1 to 12Mpbs receive speed on a couple 10/100 cards
using the 2.2.16, 2.2.19 and 2.4.3 kernels.
I have tried increasing the size of the RX ring buffer and it did not seem
to make any difference. It appears that there is some sort of overrun or
other problem. There is a significant slowdown between the 2.2.x and 2.4.x
However, just tonight, while really hammering on the system, I started to
get some messages like "eth1: Oversized Ethernet frame spanned multiple
buffers, status 7fff8301!". Any ideas what could be causing that?
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