Hello Jens,
On Tue, Apr 06, 2021 at 11:19:33AM +0800, Ming Lei wrote:
> Yanhui found that write performance is degraded a lot after applying
> hctx shared tagset on one test machine with megaraid_sas. And turns out
> it is caused by none scheduler which becomes default elevator caused by
> hctx shared tagset patchset.
>
> Given more scsi HBAs will apply hctx shared tagset, and the similar
> performance exists for them too.
>
> So keep previous behavior by still using default mq-deadline for queues
> which apply hctx shared tagset, just like before.
>
> Fixes: 32bc15afed04 ("blk-mq: Facilitate a shared sbitmap per tagset")
> Reported-by: Yanhui Ma <yama@xxxxxxxxxx>
> Cc: John Garry <john.garry@xxxxxxxxxx>
> Cc: Hannes Reinecke <hare@xxxxxxx>
> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Any chance to make it in 5.12 if you are fine?
Thanks,
Ming
