diff options
| author | Don Brace <don.brace@microchip.com> | 2021-03-11 14:15:56 -0600 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-04-05 23:02:30 -0400 |
| commit | c7ffedb3a774a835450a518566639254534e72c4 (patch) | |
| tree | 0da64b6f5d7347725eca9058787159ae01fb286c /drivers/scsi/smartpqi/smartpqi.h | |
| parent | 583891c9e509256a2b2902607c2e7a7c36beb0d3 (diff) | |
| download | linux-c7ffedb3a774a835450a518566639254534e72c4.tar.bz2 | |
scsi: smartpqi: Add stream detection
Enhance performance by adding sequential stream detection for RAID5/RAID6
sequential write requests. Reduce stripe lock contention with full-stripe
write operations.
There is one common stripe lock for each RAID volume that can be set by
either the RAID engine or the AIO engine. The AIO path has I/O request
sizes well below the stripe size resulting in many Read-Modify-Write
operations.
Sending the request to the RAID engine allows for coalescing requests into
full stripe operations resulting in reduced Read-Modify-Write operations.
Link: https://lore.kernel.org/r/161549375693.25025.2962141451773219796.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/smartpqi/smartpqi.h')
| -rw-r--r-- | drivers/scsi/smartpqi/smartpqi.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h index 6639432f3dab..976bfd8c5192 100644 --- a/drivers/scsi/smartpqi/smartpqi.h +++ b/drivers/scsi/smartpqi/smartpqi.h @@ -1043,6 +1043,13 @@ struct pqi_scsi_dev_raid_map_data { #define RAID_CTLR_LUNID "\0\0\0\0\0\0\0\0" +#define NUM_STREAMS_PER_LUN 8 + +struct pqi_stream_data { + u64 next_lba; + u32 last_accessed; +}; + struct pqi_scsi_dev { int devtype; /* as reported by INQUIRY commmand */ u8 device_type; /* as reported by */ @@ -1097,6 +1104,7 @@ struct pqi_scsi_dev { struct list_head add_list_entry; struct list_head delete_list_entry; + struct pqi_stream_data stream_data[NUM_STREAMS_PER_LUN]; atomic_t scsi_cmds_outstanding; atomic_t raid_bypass_cnt; }; @@ -1296,6 +1304,7 @@ struct pqi_ctrl_info { u8 enable_r5_writes : 1; u8 enable_r6_writes : 1; u8 lv_drive_type_mix_valid : 1; + u8 enable_stream_detection : 1; u8 ciss_report_log_flags; u32 max_transfer_encrypted_sas_sata; |