Genesis/AmiTPC slower than MiamiDX. What am i doing wrong?

[pVC]

Here's some tests I made with my systems with different stacks... It seems that you can't see that much difference when downloading with IBrowse, but for FTP the difference is clear.

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Stack       FTP download   FTP upload   HTTP download
-----------------------------------------------------
A1200/030@50 (Lucent Tech WaveLAN Silver)
Genesis         420 kB/s     390 kB/s        190 kB/s
MiamiDX         220 kB/s     160 kB/s        160 kB/s

A1200/060@60 (Realtek 8139)
Genesis        1420 kB/s    1015 kB/s        500 kB/s
MiamiDX         640 kB/s     330 kB/s        455 kB/s
Miami3.x        630 kB/s     340 kB/s        400 kB/s

Pegasos 1 G3@600 (On-board VIA Rhine)
NetStack       6950 kB/s    6350 kB/s       1250 kB/s
Genesis        6850 kB/s    5910 kB/s       1250 kB/s
MiamiDX        3500 kB/s    2250 kB/s       1250 kB/s


FTP transfers were made in 10/100 Mbps LAN with 25 MB and 100 MB files. Results were pretty stable.

HTTP download was made with 10 Mbps VDSL with IBrowse. ISP's proxy was used, but results may still have bit variation. On 060 HTTP transfers were varying pretty much, those are the max values and that makes them less reliable.