linux-kernel - Re: [LSF/MM TOPIC] [ATTEND] scsi-mq

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Date:	Thu, 16 Jan 2014 18:29:49 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	lsf-pc@...ts.linux-foundation.org
CC:	linux-scsi <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LSF/MM TOPIC] [ATTEND] scsi-mq

On 1/16/2014 1:05 AM, Nicholas A. Bellinger wrote:
> Hi all,
>
> I'd like to discuss the current state of scsi-mq prototype code.
>
> And now that blk-mq is upstream for v3.13, exploring the remaining TODO
> items towards an initial scsi-mq merge sometime before 2015 is upon us.
>
> The benefits of scsi-mq remain unchanged:
>
>    - Utilizes blk-mq's native per-cpu primitive + NUMA local friendly
>      queuing of pre-allocated struct request descriptor memory
>    - Eliminates all fast-path memory allocations in SCSI-core +
>      optionally the underlying SCSI LLDs
>    - Avoids fast-path Scsi_Host->host_lock + request_queue->queue_lock
>      accesses in submission + completion paths
>
> These benefits have been discussed in greater detail in [1], and the
> latest alpha quality code is available at [2] below.
>
> The current TODO items include:
>
>   - A plan for per device SCSI error handling
>   - Proper scsi_device->sdev_gendev reference counting
>   - Queuing fairness across multiple scsi-mq devices per host
>   - Support for > 1 nr_hw_queues + conversion of qla2xxx + lpfc
>     LLDs that support native hardware multiqueue
>
> Thank you,
>
> --nab
>
> References:
>
> [1]:
> [ATTEND] scsi-mq prototype discussion
> http://marc.info/?l=linux-scsi&m=137358831329753&w=2
>
> [2]:
> scsi-mq WIP updated to v3.13-rc3
> http://marc.info/?l=linux-scsi&m=138782535731722&w=2
>

+1
I would be happy to join this discussion, I think it is also important 
to think about the interaction with iSCSI and LLDs.

Sagi.

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