[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 #10 from Matthias Apitz <guru at unixarea.de> ---

they hang all:

root at c720-r314251:~ # ls -l /dev/ug*
lrwxr-xr-x  1 root  wheel  9 11 may.  06:57 /dev/ugen0.1 -> usb/0.1.0
lrwxr-xr-x  1 root  wheel  9 11 may.  06:57 /dev/ugen0.2 -> usb/0.2.0
lrwxr-xr-x  1 root  wheel  9 11 may.  06:57 /dev/ugen0.3 -> usb/0.3.0
lrwxr-xr-x  1 root  wheel  9 11 may.  06:57 /dev/ugen1.1 -> usb/1.1.0
lrwxr-xr-x  1 root  wheel  9 11 may.  06:57 /dev/ugen1.2 -> usb/1.2.0
root at c720-r314251:~ # usbconfig -d 0.1 add_quirk UQ_NO_STRINGS
^C^C^C
root at c720-r314251:~ # usbconfig -d 0.2 add_quirk UQ_NO_STRINGS
^C
root at c720-r314251:~ # usbconfig -d 0.3 add_quirk UQ_NO_STRINGS
^C
root at c720-r314251:~ # usbconfig -d 1.1 add_quirk UQ_NO_STRINGS
^C
root at c720-r314251:~ # usbconfig -d 1.2 add_quirk UQ_NO_STRINGS
^C
root at c720-r314251:~ #

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