[Bug 244356] Writing to a USB 3.0 stick is very slow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244356

--- Comment #42 from Olivier Certner <olivier.freebsd at free.fr> ---
Created attachment 214466
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214466&action=edit
Stick KT_32G: 1st round of outputs from `usbtest`

With stick KT_32G, I get reliable results. I've only exercized read for now.

In short, I've disabled all negative tests. I also activated Sense on error,
although this seems to have no effect (more tests would be needed to prove this
for sure). If I leave "Random" for the I/O size, tests appears to stall from
the start, fails after 10s of seconds and the device is disconnected then
reconnected. If I choose "Increasing", "1 block" or "1024 blocks", tests
complete successfully.

In addition, there is a troubling fact. KT_32G is not recognized on the case's
front plugs, as reported earlier, but now also one of the MB's hub doesn't
recognize it anymore (it did before, I tested the stick plugged there, see
SD_64G_usbtest_3.txt). The machine has not been rebooted at all since I started
testing and collecting data.

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