Nonsense speed than measured by CrystalDiskMark.. 500 MB/s on max. 150MB/s USB3 drive

[ruthan]

• Linux-distro (kernel version): Mint 22
• Desktop Environment (KDE/GNOME etc.): Mate
• Qt Version:
• KDiskMark Version: #.#.# lastest in Mint repository
• FIO Version: fio-#.#

Description:

I gave it a try to find some Crystal mark alternative on Linux.. well with some flashdisks numbers where about right, but i tried Snadisk 64 GB USB2 driver.. a got twice 3-5x faster - 500MB/s numbers than on Windows 10 - 130 MB/s. I tested 128 MB and 1 run, because otherwise its too slow to wait. i test 100 MB with crystalDiskMark.

I dunnow if bug is some processing numbers error, or there is slow cache, but i doubt that some generic flashdisk would have some inner ram or something like that..

Drive is Sandisk Ep1810258312, SanDisk Ultra Dual, its advertised to be 150 MB/s.

Steps To Reproduce:

Well you probably have no such drive, but if someone before complaning about strange numbers, it would be the same problem..

[Rabcor]

probably just a case of misconfigured dirty bytes, I don't actually know of any distro that has sane default settings for it.

see for example: https://forum.manjaro.org/t/decrease-dirty-bytes-for-more-reliable-usb-transfer/120798

[ruthan]

It would be some bad tested partitions selection too, especially if there is Apple HFS or AFS filesystems on USB stick.

[Rabcor]

It would be some bad tested partitions selection too, especially if there is Apple HFS or AFS filesystems on USB stick.

that doesn't matter actually, not for the dirty config. Misconfigured dirty bytes cause your problem, always, so long as it is misconfigured you will never not have this problem with slow storage devices.