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ahci: enable full queue depth of 32

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This changes the AHCI queue depth from 31 to 32, as libata now
fully supports it. Now regular IO requests can utilize the full
tag space of SATA, not just 31. For IOPS constrained workloads,
this can result in a ~3% bump in performance.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Jens Axboe 2018-05-11 12:51:11 -06:00 committed by Tejun Heo
parent 69278f790b
commit e2d1f8a06e
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/ahci.h
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@ -384,7 +384,7 @@ extern struct device_attribute *ahci_sdev_attrs[];
*/
#define AHCI_SHT(drv_name) \
ATA_NCQ_SHT(drv_name), \
.can_queue = AHCI_MAX_CMDS - 1, \
.can_queue = AHCI_MAX_CMDS, \
.sg_tablesize = AHCI_MAX_SG, \
.dma_boundary = AHCI_DMA_BOUNDARY, \
.shost_attrs = ahci_shost_attrs, \