SSD Schedular w/btrfs

echo 'cfq' > /sys/block/sdb/queue/scheduler

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dd if=/dev/zero of=test bs=1M count=2k conv=fdatasync
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 6.91822 s, 310 MB/s
ioping -R .
--- . ( ) ioping statistics ---
17927 requests completed in 3000.1 ms, 8796 iops, 34.4 mb/s
min/avg/max/mdev = 0.0/0.1/2.1/0.0 ms

echo 'noop' > /sys/block/sdb/queue/scheduler

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dd if=/dev/zero of=test bs=1M count=2k conv=fdatasync
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 4.62311 s, 465 MB/s
ioping -R .
--- . ( ) ioping statistics ---
18380 requests completed in 3000.1 ms, 9108 iops, 35.6 mb/s
min/avg/max/mdev = 0.0/0.1/2.1/0.0 ms

echo 'deadline' > /sys/block/sdb/queue/scheduler

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dd if=/dev/zero of=test bs=1M count=2k conv=fdatasync
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 8.90896 s, 241 MB/s
ioping -R .
--- . ( ) ioping statistics ---
14309 requests completed in 3000.0 ms, 6413 iops, 25.1 mb/s
min/avg/max/mdev = 0.0/0.2/11.8/0.7 ms