linux-kernel - [PATCH 4.9 57/96] scsi: storvsc: Increase cmd_per

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Date:   Thu, 24 May 2018 11:38:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Kelley <mikelley@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 57/96] scsi: storvsc: Increase cmd_per_lun for higher speed devices

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>

[ Upstream commit cabe92a55e3a12005a4ac4d3954c9a174b0efe2a ]

Increase cmd_per_lun to allow more I/Os in progress per device,
particularly for NVMe's.  The Hyper-V host side can handle the higher
count with no issues.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com>
Acked-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/storvsc_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1580,7 +1580,7 @@ static struct scsi_host_template scsi_dr
 	.eh_timed_out =		storvsc_eh_timed_out,
 	.slave_alloc =		storvsc_device_alloc,
 	.slave_configure =	storvsc_device_configure,
-	.cmd_per_lun =		255,
+	.cmd_per_lun =		2048,
 	.this_id =		-1,
 	.use_clustering =	ENABLE_CLUSTERING,
 	/* Make sure we dont get a sg segment crosses a page boundary */