linux-kernel - Re: Drivers: scsi: FLUSH timeout

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Message-ID: <5241C9E7.2000404@cs.wisc.edu>
Date:	Tue, 24 Sep 2013 12:20:39 -0500
From:	Mike Christie <michaelc@...wisc.edu>
To:	KY Srinivasan <kys@...rosoft.com>
CC:	Jack Wang <xjtuwjp@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: Drivers: scsi: FLUSH timeout

On 09/24/2013 07:35 AM, KY Srinivasan wrote:
> 
> 
>> -----Original Message-----
>> From: Jack Wang [mailto:xjtuwjp@...il.com]
>> Sent: Tuesday, September 24, 2013 5:08 AM
>> To: KY Srinivasan
>> Cc: Greg KH; linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
>> ohering@...e.com; jbottomley@...allels.com; hch@...radead.org; linux-
>> scsi@...r.kernel.org; Mike Christie
>> Subject: Re: Drivers: scsi: FLUSH timeout
>>
>> On 09/21/2013 07:24 AM, KY Srinivasan wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Greg KH [mailto:gregkh@...uxfoundation.org]
>>>> Sent: Friday, September 20, 2013 1:32 PM
>>>> To: KY Srinivasan
>>>> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
>>>> ohering@...e.com; jbottomley@...allels.com; hch@...radead.org; linux-
>>>> scsi@...r.kernel.org
>>>> Subject: Re: Drivers: scsi: FLUSH timeout
>>>>
>>>> On Fri, Sep 20, 2013 at 12:32:27PM -0700, K. Y. Srinivasan wrote:
>>>>> The SD_FLUSH_TIMEOUT value is currently hardcoded.
>>>>
>>>> Hardcoded where?  Please, more context.
>>>
>>> This is defined in scsi/sd.h:
>>>
>>> #define SD_FLUSH_TIMEOUT        (60 * HZ)
>>>>
>>>>> On our cloud, we sometimes hit this timeout. I was wondering if we
>>>>> could make this a module parameter. If this is acceptable, I can send
>>>>> you a patch for this.
>>>>
>>>> A module parameter don't make sense for a per-device value, does it?
>>> Currently, the 60 second timeout is applied across devices. Ideally, I want to be
>>> able to control the FLUSH TIMEOUT as we currently do I/O timeout. If this is
>>> acceptable, I can work on a patch for that as well.
>>>
>>> Regards,
>>>
>>> K. Y
>>>>
>>>> greg k-h
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
>>> the body of a message to majordomo@...r.kernel.org
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>>>
>> Hi,
>>
>> Back to 2010, Mike(cc-ed) try to add a flush time out interface, similar
>> to what you want here, no idea why it's just ignored?
>> http://www.spinics.net/lists/linux-scsi/msg45017.html
> 
> Thanks Jack. Mike, do you know what the concerns were as to why this
> patch was not accepted?
> 

I do not remember the exact concerns. We ended up just increasing the
hard coded value in:

commit e3b3e6246726cd05950677ed843010b8e8c5884c
Author: Mike Christie <mchristi@...hat.com>
Date:   Wed Aug 11 11:06:25 2010 -0500

    [SCSI] scsi/block: increase flush/sync timeout


In the git commit message there is a comment about people thinking
making it configurable for users was troublesome.
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