From owner-freebsd-hackers@FreeBSD.ORG  Sat Mar 29 17:20:35 2014
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Date: Sat, 29 Mar 2014 21:20:34 +0400
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Subject: Re: [xhci] USB 3.0 not working, bug or feature usb/179342?
From: Andrey Fesenko <f0andrey@gmail.com>
To: freebsd-current <freebsd-current@freebsd.org>, 
 "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>
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On Sat, Mar 29, 2014 at 4:37 AM, Andrey Fesenko <f0andrey@gmail.com> wrote:
> and USB3 flash drive
> ugen2.4: <Kingston DataTraveler 3.0 PMAP> at usbus2, cfg=0 md=HOST
> spd=HIGH (480Mbps) pwr=ON (498mA)
> full list http://pastie.org/8963116

I apologize for panic after additional searches proper BIOS
configuration able to identify flash drive as USB3

ugen0.2: <DataTraveler 3.0 Kingston> at usbus0, cfg=0 md=HOST
spd=SUPER (5.0Gbps) pwr=ON (224mA)

while writing speed test file with ramdisk is almost unchanged :(

# dd if=/dev/random of=/mnt/ramdisck/test.file bs=10m count=198
2076180480 bytes transferred in 28.443097 secs (72994178 bytes/sec)
# dd if=/mnt/ramdisck/test.file of=/mnt/usb3/test.file bs=10m
count=198
2076180480 bytes transferred in 222.810014 secs (9318165 bytes/sec)
# dd if=/mnt/ramdisck/test.file of=/mnt/usb2/test.file bs=10m
count=198
2076180480 bytes transferred in 248.585099 secs (8351991 bytes/sec)