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scsi: hpsa: remove coalescing settings for ioaccel2 

- Setting coalescing has a significant negative impact on low
  queue-depth performance.
- Does not help high queue-depth performance.

Signed-off-by: Don Brace <don.brace@microsemi.com>
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Don Brace 2017-01-30 16:05:17 -06:00 committed by Martin K. Petersen
parent 526db94e5d
commit 96b6ce4e8b
1 changed files with 2 additions and 6 deletions
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8
drivers/scsi/hpsa.c
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@ -9263,13 +9263,9 @@ static int hpsa_enter_performant_mode(struct ctlr_info *h, u32 trans_support)
access = SA5_ioaccel_mode1_access; access = SA5_ioaccel_mode1_access;
writel(10, &h->cfgtable->HostWrite.CoalIntDelay); writel(10, &h->cfgtable->HostWrite.CoalIntDelay);
writel(4, &h->cfgtable->HostWrite.CoalIntCount); writel(4, &h->cfgtable->HostWrite.CoalIntCount);
} else { } else
if (trans_support & CFGTBL_Trans_io_accel2) { if (trans_support & CFGTBL_Trans_io_accel2)
access = SA5_ioaccel_mode2_access; access = SA5_ioaccel_mode2_access;
writel(10, &h->cfgtable->HostWrite.CoalIntDelay);
writel(4, &h->cfgtable->HostWrite.CoalIntCount);
}
}
writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL); writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
if (hpsa_wait_for_mode_change_ack(h)) { if (hpsa_wait_for_mode_change_ack(h)) {
dev_err(&h->pdev->dev, dev_err(&h->pdev->dev,