NVMe Write Speed Slow on Linux (Samsung 970 EVO Plus)

[Keith Busch]

On Fri, Feb 07, 2025 at 05:25:30PM +0100, Jamaleddine AMGHAR wrote:
> I am experiencing a significant slowdown in write speeds on my NVMe SSD
> (Samsung SSD 970 EVO Plus 1TB, firmware 2B2QEXM7) when using Linux, while
> the performance on Windows is normal.
> System Details:
> 
>    - *SSD Model*: Samsung SSD 970 EVO Plus 1TB (2B2QEXM7)
>    - *Operating System*: Ubuntu 24.04.1 LTS
>    - *Kernel Version*: 6.8.0-52-generic
>    - *Processor*: 12th Gen Intel Core i7-12700 (20 cores)
> 
> Issue Description:
> 
>    - Write speeds on Linux are significantly slower than expected, whereas
>    they perform normally on Windows.
> 
> Could you please advise on possible solutions or additional diagnostic
> steps to identify the cause of this slowdown?

There's a lot of missing information here. What workload are you
throwing at the SSD and what results are you seeing? What results are
you expecting? Are you using a filesystem? If so, which one? Are you
using parititons? If so, are they aligned? What program are you using to
evaluate your SSD performance? If you're not using 'fio', use that.