linux-kernel - [PATCH 2/2]SATA: enable flush non-queueable

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Date:	Tue, 19 Apr 2011 16:44:49 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	lkml <linux-kernel@...r.kernel.org>,
	linux-ide <linux-ide@...r.kernel.org>
Cc:	Jens Axboe <jaxboe@...ionio.com>, Jeff Garzik <jgarzik@...ox.com>,
	Christoph Hellwig <hch@...radead.org>,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 2/2]SATA: enable flush non-queueable


Set SATA queue flush non-queueable. Running below test with a AHCI controller and
ext4 filesystem, below patch gives around ~5% speedup.
sysbench --test fileio --file-test-mode rndrw --num-threads 16 \
--file-total-size 2500MB --max-requests 150000 --max-time 3000

Signed-off-by: Shaohua Li <shaohua.li@...el.com>
---
 drivers/ata/libata-scsi.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/drivers/ata/libata-scsi.c
===================================================================
--- linux.orig/drivers/ata/libata-scsi.c	2011-04-19 14:54:37.000000000 +0800
+++ linux/drivers/ata/libata-scsi.c	2011-04-19 14:58:54.000000000 +0800
@@ -3424,7 +3424,9 @@ void ata_scsi_scan_host(struct ata_port
 			sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
 						 NULL);
 			if (!IS_ERR(sdev)) {
+				struct request_queue *q = sdev->request_queue;
 				dev->sdev = sdev;
+				blk_set_queue_flush_queueable(q, false);
 				scsi_device_put(sdev);
 			} else {
 				dev->sdev = NULL;


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