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authorMing Lei <ming.lei@redhat.com>2021-01-22 10:33:16 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2021-03-04 17:37:00 -0500
commitca44532139514f5fb0a5a081cd8576e4abe54e65 (patch)
tree7f0e8ab04af9f02ae8ca281fe501c2c9e8411839 /drivers/scsi/scsi_scan.c
parent8278807abd338f2246b6ae8057f2ec61a80a5614 (diff)
scsi: core: Make sure sdev->queue_depth is <= max(shost->can_queue, 1024)
Limit SCSI device's queue depth to max(host->can_queue, 1024) in scsi_change_queue_depth(). 1024 is big enough for saturating current fast SCSI LUN(SSD or RAID volume on multiple SSDs). Also single hardware queue depth is usually enough for saturating single LUN because per-core performance is often considered in storage design. This patch is needed for replacing sdev->device_busy with sbitmap which has to be pre-allocated with reasonable max depth. Link: https://lore.kernel.org/r/20210122023317.687987-13-ming.lei@redhat.com Cc: Omar Sandoval <osandov@fb.com> Cc: Kashyap Desai <kashyap.desai@broadcom.com> Cc: Sumanesh Samanta <sumanesh.samanta@broadcom.com> Cc: Ewan D. Milne <emilne@redhat.com> Tested-by: Sumanesh Samanta <sumanesh.samanta@broadcom.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
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