[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 #15 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
Hi,

See "procstat -ak" and which thread is blocked inside USB.

When you have a non-behaving USB device which times out and never closes its
USB handle from userspace, that will block the enumeration thread, which in
turn will block usbconfig.

--HPS

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