linux-kernel - Re: [PATCH 7/7] md/raid0: align bio to io

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Message-ID: <9a59de9d-0512-445a-a051-5e98fd295f6b@molgen.mpg.de>
Date: Fri, 21 Nov 2025 09:59:54 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Yu Kuai <yukuai@...as.com>
Cc: song@...nel.org, linux-raid@...r.kernel.org,
 linux-kernel@...r.kernel.org, linan122@...wei.com, xni@...hat.com
Subject: Re: [PATCH 7/7] md/raid0: align bio to io_opt

Dear Kuai,


Thank you for your patches.

Am 21.11.25 um 06:14 schrieb Yu Kuai:
> The impact is not so significant for raid0 compared to raid5, however
> it's still more appropriate to issue IOs evenly to underlying disks.

Could you please elaborate, what the problem is, and also share your 
benchmark results and test setups?

> Signed-off-by: Yu Kuai <yukuai@...as.com>
> ---
>   drivers/md/raid0.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
> index 47aee1b1d4d1..332f413bcf51 100644
> --- a/drivers/md/raid0.c
> +++ b/drivers/md/raid0.c
> @@ -388,6 +388,8 @@ static int raid0_set_limits(struct mddev *mddev)
>   	err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
>   	if (err)
>   		return err;
> +
> +	md_config_align_limits(mddev, &lim);
>   	return queue_limits_set(mddev->gendisk->queue, &lim);
>   }
>   


Kind regards,

Paul