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From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Yanhui Ma <yama@redhat.com>,
	John Garry <john.garry@huawei.com>,
	Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH] blk-mq: set default elevator as deadline in case of hctx shared tagset
Date: Thu, 8 Apr 2021 16:36:39 +0800	[thread overview]
Message-ID: <YG7AlzvLSyyeM8lL@T590> (raw)
In-Reply-To: <20210406031933.767228-1-ming.lei@redhat.com>

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@redhat.com>
> Cc: John Garry <john.garry@huawei.com>
> Cc: Hannes Reinecke <hare@suse.de>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>

Any chance to make it in 5.12 if you are fine?

Thanks,
Ming


  parent reply	other threads:[~2021-04-08  8:36 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-06  3:19 [PATCH] blk-mq: set default elevator as deadline in case of hctx shared tagset Ming Lei
2021-04-06  3:49 ` Martin K. Petersen
2021-04-06 17:54 ` Bart Van Assche
2021-04-06 22:25 ` John Garry
2021-04-07  0:48   ` Ming Lei
2021-04-07  8:04     ` John Garry
2021-04-07 10:14       ` Ming Lei
2021-04-14  8:21         ` Kashyap Desai
2021-04-14 10:48           ` Ming Lei
2021-04-08  8:36 ` Ming Lei [this message]
2021-04-08 15:57   ` Jens Axboe

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