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[7/7] cxlflash: Increase cmd_per_lun for better throughput

Message ID 1457128520-53056-7-git-send-email-ukrishn@linux.vnet.ibm.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Uma Krishnan March 4, 2016, 9:55 p.m. UTC 
From: "Manoj N. Kumar" <manoj@linux.vnet.ibm.com>

With the current value of cmd_per_lun at 16, the throughput
over a single adapter is limited to around 150kIOPS.

Increase the value of cmd_per_lun to 256 to improve
throughput. With this change a single adapter is able to
attain close to the maximum throughput (380kIOPS).
Also change the number of RRQ entries that can be queued.

Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
 drivers/scsi/cxlflash/common.h | 8 +++++---
 drivers/scsi/cxlflash/main.c   | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

Comments

Matthew R. Ochs March 7, 2016, 6:45 p.m. UTC | #1 
> On Mar 4, 2016, at 3:55 PM, Uma Krishnan <ukrishn@linux.vnet.ibm.com> wrote:
> 
> From: "Manoj N. Kumar" <manoj@linux.vnet.ibm.com>
> 
> With the current value of cmd_per_lun at 16, the throughput
> over a single adapter is limited to around 150kIOPS.
> 
> Increase the value of cmd_per_lun to 256 to improve
> throughput. With this change a single adapter is able to
> attain close to the maximum throughput (380kIOPS).
> Also change the number of RRQ entries that can be queued.
> 
> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>

Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Uma Krishnan March 8, 2016, 5:56 p.m. UTC | #2 
On 3/4/2016 3:55 PM, Uma Krishnan wrote:
> From: "Manoj N. Kumar" <manoj@linux.vnet.ibm.com>
>
> With the current value of cmd_per_lun at 16, the throughput
> over a single adapter is limited to around 150kIOPS.
>
> Increase the value of cmd_per_lun to 256 to improve
> throughput. With this change a single adapter is able to
> attain close to the maximum throughput (380kIOPS).
> Also change the number of RRQ entries that can be queued.
>
> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>

Reviewed-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
diff mbox

Patch

diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index 5ada926..a8ac4c0 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -34,7 +34,6 @@  extern const struct file_operations cxlflash_cxl_fops;
 								   sectors
 								*/
 
-#define NUM_RRQ_ENTRY    16     /* for master issued cmds */
 #define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry))
 
 /* AFU command retry limit */
@@ -48,9 +47,12 @@  extern const struct file_operations cxlflash_cxl_fops;
 							   index derivation
 							 */
 
-#define CXLFLASH_MAX_CMDS               16
+#define CXLFLASH_MAX_CMDS               256
 #define CXLFLASH_MAX_CMDS_PER_LUN       CXLFLASH_MAX_CMDS
 
+/* RRQ for master issued cmds */
+#define NUM_RRQ_ENTRY                   CXLFLASH_MAX_CMDS
+
 
 static inline void check_sizes(void)
 {
@@ -149,7 +151,7 @@  struct afu_cmd {
 struct afu {
 	/* Stuff requiring alignment go first. */
 
-	u64 rrq_entry[NUM_RRQ_ENTRY];	/* 128B RRQ */
+	u64 rrq_entry[NUM_RRQ_ENTRY];	/* 2K RRQ */
 	/*
 	 * Command & data for AFU commands.
 	 */
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 0f062a4..3879b46 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -2253,7 +2253,7 @@  static struct scsi_host_template driver_template = {
 	.eh_device_reset_handler = cxlflash_eh_device_reset_handler,
 	.eh_host_reset_handler = cxlflash_eh_host_reset_handler,
 	.change_queue_depth = cxlflash_change_queue_depth,
-	.cmd_per_lun = 16,
+	.cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN,
 	.can_queue = CXLFLASH_MAX_CMDS,
 	.this_id = -1,
 	.sg_tablesize = SG_NONE,	/* No scatter gather support */