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Commit e2d1f8a0 authored by Jens Axboe's avatar Jens Axboe Committed by Tejun Heo
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ahci: enable full queue depth of 32 



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: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 69278f79

drivers/ata/ahci.h

+1 −1
Original line number Diff line number Diff line
@@ -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,			\