linux-kernel - Re: [PATCH 05/11] mtip32xx: Set block queue boundary variables

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Message-ID: <4FC7130B.6040506@kernel.dk>
Date:	Thu, 31 May 2012 08:43:23 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Asai Thambi S P <asamymuthupa@...ron.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sam Bradshaw <sbradshaw@...ron.com>
Subject: Re: [PATCH 05/11] mtip32xx: Set block queue boundary variables

On 05/30/2012 03:42 AM, Asai Thambi S P wrote:
> 
> Set the following block queue boundary variables
> 	* max_hw_sectors
> 	* max_segment_size
> 	* nr_requests
> 
> Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
> ---
>  drivers/block/mtip32xx/mtip32xx.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
> index 9fe897d..801e70c 100644
> --- a/drivers/block/mtip32xx/mtip32xx.c
> +++ b/drivers/block/mtip32xx/mtip32xx.c
> @@ -3631,7 +3631,11 @@ skip_create_disk:
>  	set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
>  	blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
>  	blk_queue_physical_block_size(dd->queue, 4096);
> +	blk_queue_max_hw_sectors(dd->queue, 0xffff);
> +	blk_queue_max_segment_size(dd->queue, 0x400000);
>  	blk_queue_io_min(dd->queue, 4096);
> +	dd->queue->nr_requests = 255;

->nr_requests isn't a boundary variable you set for the queue. It's set
by the core bits, or by the user via the sysfs interface.

So you should not touch that from the driver.

-- 
Jens Axboe

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