Very poor NVME performance

Solution 1:

Hmmm the numbers you provide here are way larger than 170-200MB/s. However they are wrong.

In order to bypass the page cache, causing the reads to go directly from the drive into hdparm's buffers (ie "raw" I/O), you need to use the --direct parameter in hdparm. That is:

$ sudo hdparm -Tt --direct /dev/nvme0n1

That way your results will be lower but close the actual disk's performance.

Solution 2:

Try command line (you may need to sudo apt install fio first):

fio --name TEST --eta-newline=5s --filename=fio-tempfile.dat --rw=read --size=500m --io_size=10g --blocksize=1024k --ioengine=libaio --fsync=10000 --iodepth=32 --direct=1 --numjobs=4 --runtime=60 --group_reporting

For additional details, see: https://askubuntu.com/a/991311/50254