linux-kernel - Re: [PATCH 0/2] block/SCSI MQ: two RESTART related patches

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Date:   Tue, 17 Oct 2017 13:12:10 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>
Cc:     Bart Van Assche <bart.vanassche@...disk.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Omar Sandoval <osandov@...com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH 0/2] block/SCSI MQ: two RESTART related patches

On Tue, Oct 17, 2017 at 01:04:16PM +0800, Ming Lei wrote:
> Hi Jens,
> 
> The 1st patch runs idle hctx after dealy in scsi_mq_get_budget(),
> so that we can keep same behaviour with before, and it can be
> thought as a fix.
> 
> The 2nd patch cleans up RESTART, and removes handling for TAG_SHARED
> from current blk-mq's RESTART mechanism because SCSI_MQ can covers its
> restart by itself, so that no need to handle TAG_SHARED in blk-mq
> RESTART. And >20% IOPS boost is observed in my rand read test over
> scsi_debug.
> 
> John, please test this two patches and see if it may improve your SAS
> IO performance, and you can find the two patches in the following branch:
> 
> 	https://github.com/ming1/linux/commits/blk_mq_improve_restart_V1

Forget to mention, you need to either pull the above branch directly
or apply the two patches against for-next branch of Jens' block
tree:

	git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git #for-next

-- 
Ming