I can't help but I note that you benchmark the drive with a block size of 1024. Minimum block size of a modern SSD is 4096, anything lower would just cause unnecessary load. Also if you want to benchmark a drive/block storage I highly recommend using fio.
fio --direct=1 --rw=write --ioengine=libaio --runtime=300 --bs=4k --numjobs=4 --iodepth=32 --size=2G --name=4096-direct --filename=/dev/vdb --group_reporting
Also experiment with --rw=rw|randrw|read :)
(and make sure your device is large enough to hold numjobs*size)