Re: [PATCH 0/3] scsi: scsi-mq: don't hold host_busy in IO path

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH 0/3] scsi: scsi-mq: don't hold host_busy in IO path
From: Bart Van Assche <bart.vanassche@xxxxxxx>
Date: Fri, 22 Jun 2018 08:29:20 -0700
Cc: Jens Axboe <axboe@xxxxxx>, "linux-scsi@xxxxxxxxxxxxxxx" <linux-scsi@xxxxxxxxxxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <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>
In-reply-to: <20180420065742.8043-1-ming.lei@redhat.com>
References: <20180420065742.8043-1-ming.lei@redhat.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 04/20/18 00:00, Ming Lei wrote:

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.


Hello Ming,

Do you want to resend these patches to Martin or do you perhaps that Ido that myself?


Thanks,

Bart.

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  - From: Ming Lei

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