# MD device tinning documentation

- From: Vladimir Fedorkov \<hidden\>
- Date: 2017-05-08 10:22:53 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2017/05/6635513
- Thread: https://ratatoskr.run/linux-raid/2017/05/6635513/t.md

```text
Hello there!

I'm running benchmarks and it looks like that md device is only
utilizing single core which it limiting it's performance on concurrent
(4+ threads) writes with 8 SSD drives in software RAID10

Kernel: Linux host 4.10.12-1.el7.elrepo.x86_64 #1 SMP Fri Apr 21
09:58:15 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux

Exact numbers are here: http://astellar.com/images/sysbench_rnd_writes.png

Could you please let me know if there is multi-threaded support on MD
devices in 4.x kernels and point me to the documentation (preferred)
or source code which describes tunable parts of /dev/mdXX devices.

Much appreciated!

Thank you!
---
Vlad
```