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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