On 04/04/2017 09:00 AM, Ming Lei wrote: > Just be curious, why is multi hard queue used for this case? Are there > some real cases in SCSI? Hello Ming, Yes, there is a real need for this. Background information is available in the following e-mail thread: Arun Easi, "scsi-mq - tag# and can_queue, performance", April 2, 2017, linux-scsi (http://www.spinics.net/lists/linux-scsi/msg106853.html). Bart.