Speeds are much lower then expected

[ulfklose]

Hi, I'm using a Kingston NV2, which is a PCIe 4 x4 SSD, on a system with a PCIe3 x4 interface. The SSD is able to do 3.5 GB/s read and 2.8 GB/s write. This tool averages on about 500 MB/s which seems odd to me.

hdparm (sudo hdparm -tT --direct /dev/nvme0n1) results are about 1.7 GB/s (read), GNOME's disk utility shows about 2.3 GB/s.

Am I misinterpreting the results of your tool or aren't they comparable at all?

I'd love to see something similar to the AS SSD Benchmark for Windows on Linux.

[lucaspar]

Numbers from different benchmarks can't be directly compared for several reasons, but the numbers I got from ssd-benchmark seem close to fio's when using a block size of 4k. Larger block sizes tend to yield larger speeds on benchmarks as well, perhaps as a result of reducing IOPS.

The closest way to replicate these Windows tools that report such high numbers was this script, also posted in this thread of someone trying to replicate CrystalDiskMark results on Linux.

That script gave me 5870MB/s sequential read on a Samsung 980 PRO PCIe 4.0 NVMe M2. I'd say that's in the same ballpark as the CrystalDiskMark screenshots I've seen, considering I was running the OS and many services on top as the benchmark executed.