Flow control in NVMf fabric host driver

[James Smart]

Santosh,

The linux transport implementations alloc a single blk_mq tag set which 
is shared for all io queues. The tag set is set to the same depth as an 
io SQ.  As such, the transport would never have more commands 
outstanding than can fit on a single SQ. Thus, there is no need for SQHD 
tracking and flow control in the host. This implementation may change in 
the future, but for now...

-- james



On 1/5/2017 2:05 AM, Santosh Singh wrote:
> Hi All,
>
> I am using the NVMf host driver and found that SQHD is not being used for SQ flow control any specific reason for same.
>
> Thanks
> Santosh
>
>
>
>
>
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