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

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Message-ID: <6cf082e4-6fff-21dd-4df5-a6e9e4f2847c@intel.com>
Date:   Wed, 11 Jul 2018 11:31:37 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Hannes Reinecke <hare@...e.de>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Ming Lei <tom.leiming@...il.com>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: switch to scsi-mq by default

On 11/07/18 05:52, Martin K. Petersen wrote:
> 
> Johannes,
> 
>> It has been more than one year since we tried to change the default
>> from legacy to multi queue in SCSI with commit c279bd9e406 ("scsi:
>> default to scsi-mq"). But due to issues with suspend/resume and
>> performance problems it had been reverted again with commit
>> cbe7dfa26eee ("Revert "scsi: default to scsi-mq"").
>>
>> In the meantime there have been a substantial amount of performance
>> improvements and suspend/resume got fixed as well, thus we can
>> re-enable scsi-mq without a significant performance penalty.
> 
> Applied to 4.19/scsi-queue, thanks!
> 

But there is no runtime pm support, is there?  I tried enabling runtime PM
for UFS SCSI devices with scsi-mq and it didn't work, which is a regression.