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

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Message-ID: <4FC794BD.1000309@micron.com>
Date:	Thu, 31 May 2012 08:56:45 -0700
From:	Asai Thambi S P <asamymuthupa@...ron.com>
To:	Jens Axboe <axboe@...nel.dk>
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 5/30/2012 11:43 PM, Jens Axboe wrote:

> 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.
> 

Ok.

I saw scsi lib module changing it, so thought of changing the value close to
device queue depth.

--
Regards,
Asai Thambi
--
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