[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 #72 from Maurizio <maurizio1018 at gmail.com> ---
(In reply to Olivier Certner from comment #52)
The stick, a Kingston DataTraveler G4 32GB, works well if formatted as FAT32,
bad if formatted as UFS and the performance will degrade over the time. I have
written this script for testing the stick:

#!/bin/sh
set -x
STICK_DEVICE=/dev/da0
FILE_ON_STICK=/media/5ec390d1148aa331/zero.bin
COUNT=1024
tmux new-window "script /tmp/dd.log dd if=/dev/zero of=$FILE_ON_STICK bs=1M
count=$COUNT; sleep 5; killall iostat"
tmux new-window "script /tmp/iostast.log iostat -w 1 $STICK_DEVICE"
set +x

where FILE_ON_STICK depends on the stick mount point.

I have run the script one time with good performance with the stick formatted
as FAT32, the log output are: dd_fat32.log
(https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214626 ) and
iostat_fat32.log (https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214630).
The dd instruction takes 49 sec. 

After formatting the stick as UFS I have runned the script 3 times, the dd
instruction takes 57, 141 and 189 seconds. The logs are, in order:

dd_ufs.log (https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214627 ),
iostat_ufs.log  (https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214631),

dd_usf2.log  (https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214628),
iostat_ufs2.log (https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214633)

dd_ufs3.log and 
iostat_ufs3.log (https://bugs.freebsd.org/bugzilla/attachment.cgi?id=214634)

Running the script with the stick formatted as UFS, the laptop used for the
test, hangs a little.

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