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Date:	Wed, 09 Jul 2014 21:38:12 +0200
From:	Jens Axboe <>
To:, Christoph Hellwig <>,
	James Bottomley <>,
	Bart Van Assche <>,
	Robert Elliott <>,,
Subject: Re: scsi-mq V2

On 2014-07-09 18:39, Douglas Gilbert wrote:
> On 14-07-08 10:48 AM, Christoph Hellwig wrote:
>> On Wed, Jun 25, 2014 at 06:51:47PM +0200, Christoph Hellwig wrote:
>>> Changes from V1:
>>>   - rebased on top of the core-for-3.17 branch, most notable the
>>>     scsi logging changes
>>>   - fixed handling of cmd_list to prevent crashes for some heavy
>>>     workloads
>>>   - fixed incorrect handling of !target->can_queue
>>>   - avoid scheduling a workqueue on I/O completions when no queues
>>>     are congested
>>> In addition to the patches in this thread there also is a git
>>> available at:
>>>     git:// scsi-mq.2
>> I've pushed out a new scsi-mq.3 branch, which has been rebased on the
>> latest core-for-3.17 tree + the "RFC: clean up command setup" series
>> from June 29th.  Robert Elliot found a problem with not fully zeroed
>> out UNMAP CDBs, which is fixed by the saner discard handling in that
>> series.
>> There is a new patch to factor the code from the above series for
>> blk-mq use, which I've attached below.  Besides that the only changes
>> are minor merge fixups in the main blk-mq usage patch.
> Be warned: both Rob Elliott and I can easily break
> the scsi-mq.3 branch. It seems as though a regression
> has slipped in. I notice that Christoph has added a
> new branch called "scsi-mq.3-no-rebase".

Rob/Doug, those issues look very much like problems in the aio code. Can 
either/both of you try with:


reverted (in that order) and see if that changes anything.

Jens Axboe

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