[LSF/MM TOPIC] [ATTEND] scsi-mq

[LSF/MM TOPIC] [ATTEND] scsi-mq

[Nicholas A. Bellinger]

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

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

[Sagi Grimberg]

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.

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

[James Smart]

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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