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cxlflash: Increase cmd_per_lun for better throughput 

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>
Reviewed-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Manoj N. Kumar 2016-03-04 15:55:20 -06:00 committed by Martin K. Petersen
parent 603ecce95f
commit 83430833b4
2 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/scsi/cxlflash/common.h
View File

@ -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.
*/

2
drivers/scsi/cxlflash/main.c
View File

@ -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 */