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From:   KY Srinivasan <kys@microsoft.com>
To:     "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
        "Stephen Hemminger" <sthemmin@microsoft.com>,
        "martin.petersen@oracle.com" <martin.petersen@oracle.com>,
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        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: RE: [PATCH 1/1] scsi: storvsc: Increase cmd_per_lun for higher speed
 devices
Thread-Topic: [PATCH 1/1] scsi: storvsc: Increase cmd_per_lun for higher speed
 devices
Thread-Index: AQHTlWWojcBZAOPPnEOXMIrtBDDiUaOOWH7g
Date:   Wed, 31 Jan 2018 18:34:23 +0000
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> -----Original Message-----
> From: Michael Kelley (EOSG)
> Sent: Wednesday, January 24, 2018 2:50 PM
> To: KY Srinivasan <kys@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; martin.petersen@oracle.com; Long Li
> <longli@microsoft.com>; jejb@linux.vnet.ibm.com;
> devel@linuxdriverproject.org; linux-kernel@vger.kernel.org; linux-
> scsi@vger.kernel.org
> Cc: Michael Kelley (EOSG) <Michael.H.Kelley@microsoft.com>
> Subject: [PATCH 1/1] scsi: storvsc: Increase cmd_per_lun for higher speed
> devices
>=20
> 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.
>=20
> Signed-off-by: Michael Kelley <mikelley@microsoft.com>

Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>

Thanks,

K. Y
> ---
>  drivers/scsi/storvsc_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>=20
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index f3264c4..6205107 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1657,7 +1657,7 @@ static int storvsc_queuecommand(struct Scsi_Host
> *host, struct scsi_cmnd *scmnd)
>  	.eh_timed_out =3D		storvsc_eh_timed_out,
>  	.slave_alloc =3D		storvsc_device_alloc,
>  	.slave_configure =3D	storvsc_device_configure,
> -	.cmd_per_lun =3D		255,
> +	.cmd_per_lun =3D		2048,
>  	.this_id =3D		-1,
>  	.use_clustering =3D	ENABLE_CLUSTERING,
>  	/* Make sure we dont get a sg segment crosses a page boundary */
> --
> 1.8.3.1