Hi all!

I need some advice how to best tackle this problem I'm having with an ADMtek 
USB To LAN Converter in conjunction with an nVidia nForce MCP79 USB chip:

--- config begin ---
root@creutzfeld:(~)# uname -a
FreeBSD creutzfeld.z.net 8.2-STABLE FreeBSD 8.2-STABLE #7 r226546: Wed Oct 19 
22:08:28 CEST 2011     root@creutzfeld:/usr/obj/usr/src/sys/CREUTZFELD  amd64
root@creutzfeld:(~)# usbconfig list
ugen0.1: <OHCI root HUB nVidia> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) 
ugen1.1: <EHCI root HUB nVidia> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps) 
ugen2.1: <OHCI root HUB nVidia> at usbus2, cfg=0 md=HOST spd=FULL (12Mbps) 
ugen3.1: <EHCI root HUB nVidia> at usbus3, cfg=0 md=HOST spd=HIGH (480Mbps) 
ugen3.2: <USB To LAN Converter ADMtek> at usbus3, cfg=0 md=HOST spd=HIGH 
(480Mbps) pwr=ON
ehci1: <NVIDIA nForce MCP79 USB 2.0 controller> mem 0xfae7e800-0xfae7e8ff irq 
21 at device 6.1 on pci0
--- config end ---

This ADMtek device gets roughly 10MBit downstream with the configuration above. 
When used with the same OS on a board with an Intel 82801GB/R (ICH7) USB 2.0 
controller it gets 64MBit downstream, which is the maximum I can get from my 

I don't see anything unusual in the system messages, thus I suspect it's an 
issue with the USB implementation for the nForce chipset.

What can I do in order to find out what's the bottleneck here?

Thanks in advance,


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