High speed USB 2.0

[Василий Петров]

I'm using some USB 2.0 devices. They was tested in windows and transfer rates 
was about 10Mbps. However under my FreeBSD installation (FreeBSD 6.0) 
transfer rates are only up to 800Kbps (like for USB 1.0).
I've checked that all required drivers (ehci especially) are built into 
kernel. usbdevs shows that device is high speed and is connected to high 
speed bus. However transfer rates are low as mentioned.
How to get high transfer rates?