From: Igor Pylypiv <ipylypiv@xxxxxxxxxx>
Increase the number of reserved tags to prevent command processing
failures when the driver is under stress. 8 reserved tags are quickly
getting all used up leading to errors when command completions are
delayed.
The driver needs ~512 ccbs/tags for maximum I/O utilization:
16 (max disks) * 32 (max SATA queue depth) = ~512 ccbs/tags.
By reserving 128 tags the driver will still have plenty of tags/ccbs
left: 1024 (max ccbs) - 128 (reserved slot) = 896 tags/ccbs left.
Signed-off-by: Igor Pylypiv <ipylypiv@xxxxxxxxxx>
Signed-off-by: Salomon Dushimirimana <salomondush@xxxxxxxxxx>
---
drivers/scsi/pm8001/pm8001_defs.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/pm8001/pm8001_defs.h b/drivers/scsi/pm8001/pm8001_defs.h
index 501b574239e8..abe6560a5817 100644
--- a/drivers/scsi/pm8001/pm8001_defs.h
+++ b/drivers/scsi/pm8001/pm8001_defs.h
@@ -90,7 +90,7 @@ enum port_type {
#define PM8001_MAX_PORTS 16 /* max. possible ports */
#define PM8001_MAX_DEVICES 2048 /* max supported device */
#define PM8001_MAX_MSIX_VEC 64 /* max msi-x int for spcv/ve */
-#define PM8001_RESERVE_SLOT 8
+#define PM8001_RESERVE_SLOT 128
#define CONFIG_SCSI_PM8001_MAX_DMA_SG 528
#define PM8001_MAX_DMA_SG CONFIG_SCSI_PM8001_MAX_DMA_SG
--
2.47.0.338.g60cca15819-goog
