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SubjectRe: [RFC] scsi: switch to scsi-mq by default
On 04/07/2018 00:21, Bart Van Assche wrote:
> 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.

We were seeing performance drops previously for hisi_sas when originally
enabled by default, but results on 4.18 seem almost identical with and
without MQ default.


Acked-by: John Garry <>


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