Maximum SCSI device queue depth limited to 1024 is not sufficient
for RAID volumes configured behind Broadcom RAID controllers.
For a 16 drives RAID volume with 1024 device QD, per drive
64 IOs(1024/16) can be issued which is not good enough to achieve
performance target.
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Sumanesh Samanta <sumanesh.samanta@xxxxxxxxxxxx>
Signed-off-by: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>
---
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 211aace69c22..735b6c862b46 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -200,11 +200,11 @@ 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);
}
/**
--
2.27.0
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