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scsi: smartpqi: Speed up RAID 10 sequential reads 

Use all data disks for sequential read operations.

Testing discovered inconsistent performance on RAID 10 volumes when
performing 256K sequential reads. The driver was only using a single
tracker to determine which physical drive to send a request to for AIO
requests.

Change the single tracker (next_bypass_group) to an array of trackers based
on the number of data disks in a row of the RAID map.

Link: https://lore.kernel.org/r/164375212842.440833.6733971458765002128.stgit@brunhilda.pdev.net
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Mike McGowen <Mike.McGowen@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike McGowen 2022-02-01 15:48:48 -06:00 committed by Martin K. Petersen
parent 3ada501d60
commit 5d8fbce04d
2 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/scsi/smartpqi/smartpqi.h
View File

@ -919,6 +919,7 @@ union pqi_reset_register {
#define PQI_MAX_TRANSFER_SIZE_KDUMP (512 * 1024U)
#define RAID_MAP_MAX_ENTRIES 1024
#define RAID_MAP_MAX_DATA_DISKS_PER_ROW 128
#define PQI_PHYSICAL_DEVICE_BUS 0
#define PQI_RAID_VOLUME_BUS 1
@ -1125,7 +1126,7 @@ struct pqi_scsi_dev {
u8 ncq_prio_support;
bool raid_bypass_configured; /* RAID bypass configured */
bool raid_bypass_enabled; /* RAID bypass enabled */
u32 next_bypass_group;
u32 next_bypass_group[RAID_MAP_MAX_DATA_DISKS_PER_ROW];
struct raid_map *raid_map; /* RAID bypass map */
u32 max_transfer_encrypted;

6
drivers/scsi/smartpqi/smartpqi_init.c
View File

@ -2058,7 +2058,7 @@ static void pqi_scsi_update_device(struct pqi_ctrl_info *ctrl_info,
sizeof(existing_device->box));
memcpy(existing_device->phys_connector, new_device->phys_connector,
sizeof(existing_device->phys_connector));
existing_device->next_bypass_group = 0;
memset(existing_device->next_bypass_group, 0, sizeof(existing_device->next_bypass_group));
kfree(existing_device->raid_map);
existing_device->raid_map = new_device->raid_map;
existing_device->raid_bypass_configured =
@ -2963,11 +2963,11 @@ static int pqi_raid_bypass_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info,
if (rmd.is_write) {
pqi_calc_aio_r1_nexus(raid_map, &rmd);
} else {
group = device->next_bypass_group;
group = device->next_bypass_group[rmd.map_index];
next_bypass_group = group + 1;
if (next_bypass_group >= rmd.layout_map_count)
next_bypass_group = 0;
device->next_bypass_group = next_bypass_group;
device->next_bypass_group[rmd.map_index] = next_bypass_group;
rmd.map_index += group * rmd.data_disks_per_row;
}
} else if ((device->raid_level == SA_RAID_5 ||