The qd for ARC Native disks is calculated by dividing the max IO 1024
by the number of disks or 256 which ever is lower. This causes poor
disk IO performance.
The fix is set the qd based on the type of disk (SAS - 64 and SATA -
32).
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@xxxxxxxxxxxxx>
Reviewed-by: David Carroll <david.carroll@xxxxxxxxxxxxx>
---
Changes in V2:
None
drivers/scsi/aacraid/aacraid.h | 1 +
drivers/scsi/aacraid/linit.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index d036a80..3ede6de 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -415,6 +415,7 @@ struct aac_ciss_identify_pd {
* These macros convert from physical channels to virtual channels
*/
#define CONTAINER_CHANNEL (0)
+#define NATIVE_CHANNEL (1)
#define CONTAINER_TO_CHANNEL(cont) (CONTAINER_CHANNEL)
#define CONTAINER_TO_ID(cont) (cont)
#define CONTAINER_TO_LUN(cont) (0)
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 5a201da..5e1a2d6 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -466,6 +466,17 @@ static int aac_slave_configure(struct scsi_device *sdev)
++num_lsu;
depth = (host->can_queue - num_one) / num_lsu;
+
+ if (sdev_channel(sdev) != NATIVE_CHANNEL)
+ goto common_config;
+
+ /*
+ * Check if SATA drive
+ */
+ if (strncmp(sdev->vendor, "ATA", 3) == 0)
+ depth = 32;
+ else
+ depth = 64;
}
common_config:
--
2.7.4
