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scsi: pm80xx: Increase reserved tags from 8 to 128 

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@google.com>
Signed-off-by: Salomon Dushimirimana <salomondush@google.com>
Link: https://lore.kernel.org/r/20241126224923.973528-1-salomondush@google.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Igor Pylypiv 2024-11-26 22:49:23 +00:00 committed by Martin K. Petersen
parent 4c567a9d0e
commit b64004dbcd
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/pm8001/pm8001_defs.h
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@ -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 PM8001_SECTOR_SIZE 512
#define PM8001_PAGE_SIZE_4K 4096