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

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Message-ID: <4FC7B491.9030105@micron.com>
Date:	Thu, 31 May 2012 11:12:33 -0700
From:	Asai Thambi S P <asamymuthupa@...ron.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Jens Axboe <axboe@...nel.dk>,
	"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 5/31/2012 10:12 AM, Jeff Moyer wrote:

> Asai Thambi S P <asamymuthupa@...ron.com> writes:
> 
>> 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.
> 
> That's actually a fair point.  What is the device queue depth for this
> card?
> 


256
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