too low write rate by gnome-disks' benchmark

[Compinfer]

The current version (UDisks 2.8.2, ubuntu 19.04) of gnome-disks shows too low write speed for my new nvme m.2 ssd Samsung 970 pro.

It shows write rate 583,6 MB/s but it must be 2.7 GB/s
The read rate is OK (3.3 GB/s).

Results are in attached screenshot.

To make sure that this is not hardware/kernel issue, I used fio benchmark:

fio --name TEST --eta-newline=5s --filename=fio-tempfile.dat --rw=write --size=1500m --io_size=10g --blocksize=1024k --ioengine=libaio --fsync=10000 --iodepth=32 --direct=1 --numjobs=1 --runtime=60 --group_reporting
<...>
WRITE: bw=2592MiB/s (2718MB/s), 2592MiB/s-2592MiB/s (2718MB/s-2718MB/s), io=10.0GiB (10.7GB), run=3950-3950msec

I also compared with the results of the same utility from ubuntu 16.10, and there the rates are fine (write 2.7 Gb/s, read 3.2 GB/s)

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gnome-disk-utility 3.32.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-20.21-generic 5.0.8
Uname: Linux 5.0.0-20-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Fri Jul 12 21:02:59 2019
InstallationDate: Installed on 2019-05-18 (55 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: gnome-disk-utility
UpgradeStatus: No upgrade log present (probably fresh install)

[Compinfer (nvkinf)]

The problem persists, ubuntu 19.10, GNOME 3.34.0, UDisks 2.8.4

[Sebastien Bacher (seb128)]

Thank you for your bug report, could you report it upstream on https://gitlab.gnome.org/GNOME/gnome-disk-utility/issues ?