[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 #22 from Matthias Apitz <guru at unixarea.de> ---
(In reply to Hans Petter Selasky from comment #21)

I did so but this does not give any visible change in the problem:

root at c720-r314251:/home/guru # sysctl -a | grep enumeration
hw.usb.disable_enumeration: 0
dev.uhub.2.disable_enumeration: 1
dev.uhub.1.disable_enumeration: 0
dev.uhub.0.disable_enumeration: 0

root at c720-r314251:/home/guru # usbdump -i usbus0
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel

root at c720-r314251:/home/guru # usbdump -i usbus1
07:13:47.895287 usbus1.2
DONE-CTRL-EP=00000080,SPD=HIGH,NFR=0,SLEN=0,IVAL=0,ERR=TIMEOUT
07:13:47.962218 usbus1.2 SUBM-CTRL-EP=00000080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
07:13:52.863603 usbus1.2
DONE-CTRL-EP=00000080,SPD=HIGH,NFR=0,SLEN=0,IVAL=0,ERR=TIMEOUT
07:13:52.926434 usbus1.2 SUBM-CTRL-EP=00000080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
^C
4 packets captured
4 packets received by filter
0 packets dropped by kernel

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