[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 #86 from Olivier Certner <olivier.freebsd at free.fr> ---
I did a new test on SD_128G with exFAT, after zeroing the whole stick, using
`cp -af /usr`. I now get 23.1MiB/s globally, whereas in the previous test I
reported 12.3MiB/s. Average bandwidth when not stalled is a bit better
(53.3MiB/s vs. 48MiB/s previously). Stall duration was ~57% of the total test
duration (vs ~74% before).

So, this:
1. Confirms that zeroing the stick before writing indeed improves performance a
lot: Bandwidth almost doubles for exFAT, which was also the case for UFS (see
comment #75, 4.3 => 7.8MiB/s).
2. Confirms the wide gap between exFAT and UFS performance (almost 3x better
bandwidth for exFAT) when compared in a (more) similar setting.

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