From 5d8fbce04d36dfd837d655e3d1b66e44b8fafbe5 Mon Sep 17 00:00:00 2001
From: Mike McGowen <Mike.McGowen@microchip.com>
Date: Tue, 1 Feb 2022 15:48:48 -0600
Subject: 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>
---
drivers/scsi/smartpqi/smartpqi_init.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
(limited to 'drivers/scsi/smartpqi/smartpqi_init.c')
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 8bd4de6306db..18c695202c52 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -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 ||
--
cgit