linux-kernel - Re: [RFC] scsi: switch to scsi-mq by default

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Date:   Tue, 3 Jul 2018 08:56:03 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     Christoph Hellwig <hch@....de>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Ming Lei <tom.leiming@...il.com>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>
Subject: Re: [RFC] scsi: switch to scsi-mq by default

On 07/03/2018 08:54 AM, Johannes Thumshirn wrote:
> It has been more than one year since we tried to change the default
> from legacy to multi queue in SCSI. Back then we had to retract the
> change because of performance issues with rotating disks.
> 
> In the meantime there have been a substantial amount of performance
> improvements, thus we can re-enable scsi-mq without a significant
> performance penalty.
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> ---
>  drivers/scsi/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> index 35c909bbf8ba..bd115bab162e 100644
> --- a/drivers/scsi/Kconfig
> +++ b/drivers/scsi/Kconfig
> @@ -49,6 +49,7 @@ config SCSI_NETLINK
>  
>  config SCSI_MQ_DEFAULT
>  	bool "SCSI: use blk-mq I/O path by default"
> +	default y
>  	depends on SCSI
>  	---help---
>  	  This option enables the new blk-mq based I/O path for SCSI
> 

Yeah, let's try it.

Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
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