On Wednesday 19 October 2011 23:34:41 Marcus Müller wrote:
> 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)
> pwr=SAVE ugen1.1: <EHCI root HUB nVidia> at usbus1, cfg=0 md=HOST spd=HIGH
> (480Mbps) pwr=SAVE ugen2.1: <OHCI root HUB nVidia> at usbus2, cfg=0
> md=HOST spd=FULL (12Mbps) pwr=SAVE ugen3.1: <EHCI root HUB nVidia> at
> usbus3, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE 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 ISP.
> 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?


The Nvidia chipsets are quirked due to what looks like hardware issues. See 
sys/dev/usb/controller/ehci_pci.c. This affects performance.

Also see "sysctl hw.usb.ehci".

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