Re: [PATCH V2 0/2] scsi: scsi-mq: don't hold host_busy in IO path

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH V2 0/2] scsi: scsi-mq: don't hold host_busy in IO path
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Tue, 26 Jun 2018 12:53:44 -0400
Cc: linux-scsi@xxxxxxxxxxxxxxx, Jens Axboe <axboe@xxxxxx>, linux-block@xxxxxxxxxxxxxxx, Omar Sandoval <osandov@xxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, James Bottomley <james.bottomley@xxxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Don Brace <don.brace@xxxxxxxxxxxxx>, Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>, Mike Snitzer <snitzer@xxxxxxxxxx>, Hannes Reinecke <hare@xxxxxxx>, Laurence Oberman <loberman@xxxxxxxxxx>, Bart Van Assche <bart.vanassche@xxxxxxx>
In-reply-to: <20180624140327.28146-1-ming.lei@redhat.com> (Ming Lei's message of "Sun, 24 Jun 2018 22:03:25 +0800")
Organization: Oracle Corporation
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Ming,

> This patches removes the expensive atomic opeation on host-wide
> counter of .host_busy for scsi-mq, and it is observed that IOPS can be
> increased by 15% with this change in IO test over scsi_debug.

Applied to 4.19/scsi-queue, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

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References:
- [PATCH V2 0/2] scsi: scsi-mq: don't hold host_busy in IO path
  - From: Ming Lei

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