From: Sumit Saxena <sumit.saxena@broadcom.com> mainline inclusion from mainline-v5.19-rc1 commit f9bdac31cf4b8609c1b241749b0ceb8f67c8685b category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB4C27 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------- 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: Sumit Saxena <sumit.saxena@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Zheng Qixing <zhengqixing@huawei.com> --- drivers/scsi/scsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 77cb26bb4df4..3bf010fe6b00 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -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); } /** -- 2.39.2