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

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Date:   Tue, 3 Jul 2018 23:21:18 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "jthumshirn@...e.de" <jthumshirn@...e.de>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "hch@....de" <hch@....de>,
        Bart Van Assche <Bart.VanAssche@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hare@...e.de" <hare@...e.de>,
        "tom.leiming@...il.com" <tom.leiming@...il.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [RFC] scsi: switch to scsi-mq by default

On Tue, 2018-07-03 at 08:54 +0200, 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.

Hello Johannes,

Please include references to commits cbe7dfa26eee ("Revert "scsi:
default to scsi-mq"") and 5c279bd9e406 ("scsi: default to scsi-mq").
I think it's a good idea to mention that suspend/resume now works
with scsi-mq.

Bart.