linux-kernel - Re: scsi-mq V2

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Date:	Wed, 09 Jul 2014 12:39:29 -0400
From:	Douglas Gilbert <dgilbert@...erlog.com>
To:	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <axboe@...nel.dk>,
	Bart Van Assche <bvanassche@...ionio.com>,
	Robert Elliott <Elliott@...com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: scsi-mq V2

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://git.infradead.org/users/hch/scsi.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".

For those interested, watch this space.

Doug Gilbert

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