Re: [RFC PATCH 0/2] block,scsi: support host-wide tagset

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On Tue, 2017-04-04 at 08:32 -0700, Omar Sandoval wrote:
> blk-mq already supports a shared tagset, and scsi-mq already uses that.
> When we initialize a request queue, we add it to a tagset with
> blk_mq_add_queue_set(), where we automatically mark the tagset as shared
> if there is more than one queue using it. What does this do that
> BLK_MQ_F_TAG_SHARED doesn't cover?

Hello Omar,

Today blk-mq creates one tag set per hardware queue. The sharing by
scsi-mq is between request queues for hardware queues that have the same
index but not between hardware queues of a single request queue. My
understanding is that the goal of this patch series is to make it possible
to use a single tag set for all hardware queues and all request queues that
share the same SCSI host.

Bart.



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