Can etcd use a dax(pmem)-based file system as the backend storage?

[git-yww]

I am trying to use pmem device to improve the write performance of etcd by placing the data-dir in a dax-based file system. And, i've tried etcd benchmark tool to test the write performance.
./benchmark --endpoints=ep1,ep2,ep3,ep4,ep5 --conns=100 --clients=1000 put --key-size=8 --total=1000000 --val-size=10240
However, the result shows that both Requests/sec and Latency performance are a little bit worse than tests by ssd.
I'm wondering if etcd does not support this feature or if my usage is incorrect?
Can anyone help me?