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JonMagon / KDiskMark

A simple open-source disk benchmark tool for Linux distros
GNU General Public License v3.0
1.04k stars 43 forks source link

kdiskmark is giving inaccurate readings? #136

Closed fennectech closed 8 months ago

fennectech commented 8 months ago

Is it possible for kdiskmark to give inaccurate readings? I tested my array with your tool and it reported about 200 MB/s with a 6GB test file but using ddrescue to write zeros to the same FS on the same drive is averaging 600 MB/s the load on the system is minimal the drive is under the same external load (seeding linux ISOs at a few hundred kb/s) in both tests
the numbers are repeatable.

im sure none of the logic is to blame here but is it possible that there is a bottleneck in FIO? FS is btrfs the results are accurate when i do the same test with my internal NVME drive

JonMagon commented 8 months ago

Depends on how exactly ddrescue works. Try selecting other test params or using other software.

fennectech commented 8 months ago

It was BTRFS compression.