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SubjectRe: [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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