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

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Date:	Wed, 22 Jan 2014 14:02:02 -0500
From:	James Smart <james.smart@...lex.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	<lsf-pc@...ts.linux-foundation.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LSF/MM TOPIC] [ATTEND] scsi-mq

James,

I'd like to attend to participate in the  EH, MQ, and T10 PI RDMA 
discussions.

-- james s



On 1/16/2014 11:29 AM, Sagi Grimberg wrote:
> 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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>

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