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blk-mq: set default elevator as deadline in case of hctx shared tagset 

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: 32bc15afed ("blk-mq: Facilitate a shared sbitmap per tagset")
Reported-by: Yanhui Ma <yama@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20210406031933.767228-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-04-06 11:19:33 +08:00 committed by Jens Axboe
parent 393bb12e00
commit 580dca8143
1 changed files with 2 additions and 1 deletions
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3
block/elevator.c
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@ -621,7 +621,8 @@ static inline bool elv_support_iosched(struct request_queue *q)
*/
static struct elevator_type *elevator_get_default(struct request_queue *q)
{
if (q->nr_hw_queues != 1)
if (q->nr_hw_queues != 1 &&
!blk_mq_is_sbitmap_shared(q->tag_set->flags))
return NULL;
return elevator_get(q, "mq-deadline", false);