[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 #16 from vidwer+fbsdbugs at gmail.com ---
I'll be following this.

With the USB DA device from
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235897 dd and rsync transfers
to UFS and to ZFS seem to stall, after a while.
A 120-something transfer speed of a large generated file (dd if=/dev/urandom
of=foo bs=1M count=1048576) stalls, drops to 10-something transfer speed,
stalls again and drops to KB/s speeds. After interrupting rsync, I ran 'time
sync', which takes 'real 2m15.632s'.

Because of the dd observation, perhaps 'disk cache' can't keep up with the
amount of writes?

rsync to UFS on USB 2.0 storage:
sent 1,074,155,802 bytes  received 76 bytes  9,633,685.00 bytes/sec

rsync to UFS on USB 3.0 storage:
sent 1,074,155,802 bytes  received 76 bytes  2,438,492.35 bytes/sec

I can test patches on 13-CURRENT.

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