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

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Message-ID: <CACVXFVOVxP+o66RG_Dk-yBTcUo54Y9c_52=3TpCQna9Se1NXkw@mail.gmail.com>
Date:   Tue, 3 Jul 2018 14:59:21 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Hannes Reinecke <hare@...e.de>,
        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 Tue, Jul 3, 2018 at 2:54 PM, Johannes Thumshirn <jthumshirn@...e.de> 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
> --
> 2.16.4
>

Reviewed-by: Ming Lei <ming.lei@...hat.com>


thanks,
Ming Lei