# Re: Inject I/O latency for RAID5/6 read and writes

- From: Alireza Haghdoost \<hidden\>
- Date: 2015-03-12 21:31:36 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2015/03/6629184
- Thread: https://ratatoskr.run/linux-raid/2015/02/6629094/t.md

```text
On Mon, Feb 23, 2015 at 12:32 PM, Alireza Haghdoost [ref] wrote:
> I needed to inject I/O completion latency in the RAID5/6 codes for
> test purpose. I was wondering where would be the good place in
> md/raid5.c code to add delay ?
>
> So far I have tried adding mdelay/udelay in raid5_end_write_request()
> and it seems it works to increase I/O completion of writes. However,
> adding delay in raid5_end_read_request() does not really change the
> read I/O latency. Any idea ?
>
> --Alireza

Can Some one help me on this issue ?
```