[9/9] ahci: enable full queue depth of 32

Message ID	1526064671-7528-10-git-send-email-axboe@kernel.dk
State	Not Applicable
Delegated to:	David Miller
Headers	show Return-Path: <linux-ide-owner@vger.kernel.org> From: Jens Axboe <axboe@kernel.dk> To: linux-ide@vger.kernel.org Cc: tj@kernel.org, Jens Axboe <axboe@kernel.dk> Subject: [PATCH 9/9] ahci: enable full queue depth of 32 Date: Fri, 11 May 2018 12:51:11 -0600 Message-Id: <1526064671-7528-10-git-send-email-axboe@kernel.dk> In-Reply-To: <1526064671-7528-1-git-send-email-axboe@kernel.dk> References: <1526064671-7528-1-git-send-email-axboe@kernel.dk> Sender: linux-ide-owner@vger.kernel.org Precedence: bulk
Series	libata: anable full 32 tag queue depth \| expand [PATCHSET,0/9] libata: anable full 32 tag queue depth [1/9] libata: introduce notion of separate hardware tags [2/9] libata: convert core and drivers to ->hw_tag usage [3/9] libata: bump ->qc_active to a 64-bit type [4/9] libata: use ata_tag_internal() consistently [5/9] libata: remove assumption that ATA_MAX_QUEUE - 1 is the max [6/9] sata_nv: set host can_queue count appropriately [7/9] libata: add extra internal command [8/9] libata: don't clamp queue depth to ATA_MAX_QUEUE - 1 [9/9] ahci: enable full queue depth of 32

Message ID

1526064671-7528-10-git-send-email-axboe@kernel.dk

State

Not Applicable

Delegated to:

David Miller

Headers

From: Jens Axboe <axboe@kernel.dk>
To: linux-ide@vger.kernel.org
Cc: tj@kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 9/9] ahci: enable full queue depth of 32
Date: Fri, 11 May 2018 12:51:11 -0600
Message-Id: <1526064671-7528-10-git-send-email-axboe@kernel.dk>
In-Reply-To: <1526064671-7528-1-git-send-email-axboe@kernel.dk>
References: <1526064671-7528-1-git-send-email-axboe@kernel.dk>
Sender: linux-ide-owner@vger.kernel.org
Precedence: bulk

Series

libata: anable full 32 tag queue depth | expand

Commit Message

Jens Axboe May 11, 2018, 6:51 p.m. UTC

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>
---
 drivers/ata/ahci.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 824bd399f02e..1609ebab4e23 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -390,7 +390,7 @@  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,			\

[9/9] ahci: enable full queue depth of 32

Commit Message

Patch