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From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	Mike Snitzer <snitzer@redhat.com>,
	linux-scsi@vger.kernel.org, Hannes Reinecke <hare@suse.de>,
	Arun Easi <arun.easi@cavium.com>, Omar Sandoval <osandov@fb.com>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	James Bottomley <james.bottomley@hansenpartnership.com>,
	Christoph Hellwig <hch@lst.de>,
	Don Brace <don.brace@microsemi.com>,
	Kashyap Desai <kashyap.desai@broadcom.com>,
	Peter Rivera <peter.rivera@broadcom.com>,
	Laurence Oberman <loberman@redhat.com>
Subject: Re: [PATCH V3 4/8] blk-mq: introduce BLK_MQ_F_HOST_TAGS
Date: Thu, 8 Mar 2018 08:52:52 +0100	[thread overview]
Message-ID: <20180308075252.GG15748@lst.de> (raw)
In-Reply-To: <20180227100750.32299-5-ming.lei@redhat.com>

On Tue, Feb 27, 2018 at 06:07:46PM +0800, Ming Lei wrote:
> This patch can support to partition host-wide tags to multiple hw queues,
> so each hw queue related data structures(tags, hctx) can be accessed in
> NUMA locality way, for example, the hw queue can be per NUMA node.
> 
> It is observed IOPS can be improved much in this way on null_blk test.

null_blk isn't too interesting, so some real hardware number would
be very useful here.

Also the documentation should be a lot less sparse.  When are we going
to set this flag?  What help are we going to give driver authors to
guide chosing the option?

  reply	other threads:[~2018-03-08  7:52 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-27 10:07 [PATCH V3 0/8] blk-mq & scsi: fix reply queue selection and improve host wide tagset Ming Lei
2018-02-27 10:07 ` [PATCH V3 1/8] scsi: hpsa: fix selection of reply queue Ming Lei
2018-03-01 16:18   ` Don Brace
2018-03-01 19:01     ` Laurence Oberman
2018-03-01 21:19       ` Laurence Oberman
2018-03-02  2:16         ` Ming Lei
2018-03-02 14:09           ` Laurence Oberman
2018-03-02 15:03             ` Don Brace
2018-03-02 21:53               ` Laurence Oberman
2018-03-05  2:07                 ` Ming Lei
2018-03-06 17:55                   ` Martin K. Petersen
2018-03-06 19:24                   ` Martin K. Petersen
2018-03-07  0:00                     ` Ming Lei
2018-03-07  3:14                       ` Martin K. Petersen
2018-03-07 14:11                     ` Laurence Oberman
2018-03-08 13:42                       ` Ming Lei
2018-03-08 20:56                         ` Laurence Oberman
2018-03-05  7:23                 ` Kashyap Desai
2018-03-05 14:35                   ` Don Brace
2018-03-05 15:19                   ` Mike Snitzer
2018-03-02  0:47     ` Ming Lei
2018-03-08  7:50   ` Christoph Hellwig
2018-03-08  8:15     ` Ming Lei
2018-03-08  8:41       ` Hannes Reinecke
2018-03-08  9:19         ` Ming Lei
2018-03-08 15:31         ` Bart Van Assche
2018-02-27 10:07 ` [PATCH V3 2/8] scsi: megaraid_sas: " Ming Lei
2018-02-27 10:07 ` [PATCH V3 3/8] blk-mq: introduce 'start_tag' field to 'struct blk_mq_tags' Ming Lei
2018-03-08  7:51   ` Christoph Hellwig
2018-02-27 10:07 ` [PATCH V3 4/8] blk-mq: introduce BLK_MQ_F_HOST_TAGS Ming Lei
2018-03-08  7:52   ` Christoph Hellwig [this message]
2018-03-08  9:35     ` Ming Lei
2018-02-27 10:07 ` [PATCH V3 5/8] scsi: Add template flag 'host_tagset' Ming Lei
2018-02-27 10:07 ` [PATCH V3 6/8] block: null_blk: introduce module parameter of 'g_host_tags' Ming Lei
2018-02-27 10:07 ` [PATCH V3 7/8] scsi: hpsa: improve scsi_mq performance via .host_tagset Ming Lei
2018-03-08  7:54   ` Christoph Hellwig
2018-03-08 10:59     ` Ming Lei
2018-02-27 10:07 ` [PATCH V3 8/8] scsi: megaraid: " Ming Lei
2018-02-28 14:58   ` Kashyap Desai
2018-02-28 15:21     ` Ming Lei
2018-02-28 16:22       ` Laurence Oberman
2018-03-01  5:24         ` Kashyap Desai
2018-03-01  7:58           ` Ming Lei
2018-03-07  5:27     ` Ming Lei
2018-03-07 15:01       ` Kashyap Desai
2018-03-07 16:05         ` Ming Lei
2018-03-07 17:28           ` Kashyap Desai
2018-03-08  1:15             ` Ming Lei
2018-03-08 10:04               ` Kashyap Desai
2018-03-08 11:06                 ` Ming Lei
2018-03-08 11:23                   ` Ming Lei
2018-03-09  6:56                     ` Kashyap Desai
2018-03-09  8:13                       ` Ming Lei
2018-03-01 21:46 ` [PATCH V3 0/8] blk-mq & scsi: fix reply queue selection and improve host wide tagset Laurence Oberman

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