[Bug 219220] syscalls (ioctls) on USB devices are very slow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219220

--- Comment #30 from Matthias Apitz <guru at unixarea.de> ---
here is the 'usbconfig' output, when the card is not seen; it takes around 10
minutes to print the lines:

# usbconfig
ugen1.1: <Intel EHCI root HUB> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (0mA)
ugen0.1: <0x8086 XHCI root HUB> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps)
pwr=SAVE (0mA)
ugen1.2: <vendor 0x8087 product 0x8000> at usbus1, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=SAVE (0mA)

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