Commit ef9d11d6 authored by Sumit Saxena's avatar Sumit Saxena Committed by Zheng Qixing
Browse files

scsi: core: Increase max device queue_depth to 4096 

mainline inclusion
from mainline-v5.19-rc1
commit f9bdac31
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB4C27

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9bdac31cf4b8609c1b241749b0ceb8f67c8685b

-------------------------------------------

The maximum SCSI device queue depth of 1024 is not sufficient for RAID
volumes configured behind Broadcom RAID controllers.  For a 16-drive RAID
volume with a device queue depth limit of 1024, only 64 I/Os (1024/16) can
be issued per drive. That is not sufficient to saturate the device.

Link: https://lore.kernel.org/r/20220414103601.140687-1-sumit.saxena@broadcom.com


Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Signed-off-by: default avatarSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarZheng Qixing <zhengqixing@huawei.com>
parent 15e44355

drivers/scsi/scsi.c

+2 −2
Original line number Diff line number Diff line
@@ -216,11 +216,11 @@ void scsi_finish_command(struct scsi_cmnd *cmd) 




/*

 * 1024 is big enough for saturating fast SCSI LUNs.

 * 4096 is big enough for saturating fast SCSI LUNs.

 */

int scsi_device_max_queue_depth(struct scsi_device *sdev)

{

	return min_t(int, sdev->host->can_queue, 1024);

	return min_t(int, sdev->host->can_queue, 4096);

}



/**