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From: Ming Lei <ming.lei@redhat.com>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Mike Snitzer <snitzer@redhat.com>,
	Laurence Oberman <loberman@redhat.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	James Smart <james.smart@broadcom.com>,
	Ewan Milne <emilne@redhat.com>,
	Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
	Keith Busch <keith.busch@intel.com>,
	Linux NVMe Mailinglist <linux-nvme@lists.infradead.org>,
	Martin George <marting@netapp.com>,
	John Meneghini <John.Meneghini@netapp.com>,
	Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH 0/3] Provide more fine grained control over multipathing
Date: Thu, 31 May 2018 10:42:48 +0800	[thread overview]
Message-ID: <20180531024247.GA15700@ming.t460p> (raw)
In-Reply-To: <20180529072240.np5c62akbr7jqelr@linux-x5ow.site>

On Tue, May 29, 2018 at 09:22:40AM +0200, Johannes Thumshirn wrote:
> On Mon, May 28, 2018 at 11:02:36PM -0400, Mike Snitzer wrote:
> > No, what both Red Hat and SUSE are saying is: cool let's have a go at
> > "Plan A" but, in parallel, what harm is there in allowing "Plan B" (dm
> > multipath) to be conditionally enabled to coexist with native NVMe
> > multipath?
> 
> For a "Plan B" we can still use the global knob that's already in
> place (even if this reminds me so much about scsi-mq which at least we
> haven't turned on in fear of performance regressions).

BTW, for scsi-mq, we have made a little progress by commit 2f31115e940c
(scsi: core: introduce force_blk_mq), and virtio-scsi is working at
always scsi-mq mode now. Then driver can decide if .force_blk_mq needs
to be set.

Hope progress can be made in this nvme mpath issue too.

Thanks,
Ming

  parent reply	other threads:[~2018-05-31  2:43 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-25 12:53 Johannes Thumshirn
2018-05-25 12:53 ` [PATCH 1/3] nvme: provide a way to disable nvme mpath per subsystem Johannes Thumshirn
2018-05-25 13:47   ` Mike Snitzer
2018-05-31  8:17   ` Sagi Grimberg
2018-05-25 12:53 ` [PATCH 2/3] nvme multipath: added SUBSYS_ATTR_RW Johannes Thumshirn
2018-05-25 12:53 ` [PATCH 3/3] nvme multipath: add dev_attr_mpath_personality Johannes Thumshirn
2018-05-25 13:05 ` [PATCH 0/3] Provide more fine grained control over multipathing Christoph Hellwig
2018-05-25 13:58   ` Mike Snitzer
2018-05-25 14:12     ` Christoph Hellwig
2018-05-25 14:50       ` Mike Snitzer
2018-05-29  1:19         ` Martin K. Petersen
2018-05-29  3:02           ` Mike Snitzer
2018-05-29  7:18             ` Hannes Reinecke
2018-05-29  7:22             ` Johannes Thumshirn
2018-05-29  8:09               ` Christoph Hellwig
2018-05-29  9:54                 ` Mike Snitzer
2018-05-29 23:27                 ` Mike Snitzer
2018-05-30 19:05                   ` Jens Axboe
2018-05-30 19:59                     ` Mike Snitzer
2018-06-04  6:19                     ` Hannes Reinecke
2018-06-04  7:18                       ` Johannes Thumshirn
2018-06-04 12:59                         ` Christoph Hellwig
2018-06-04 13:27                           ` Mike Snitzer
2018-05-31  2:42               ` Ming Lei [this message]
2018-05-30 21:20     ` Sagi Grimberg
2018-05-30 22:02       ` Mike Snitzer
2018-05-31  8:37         ` Sagi Grimberg
2018-05-31 12:37           ` Mike Snitzer
2018-05-31 16:34             ` Christoph Hellwig
2018-06-01  4:11               ` Mike Snitzer
2018-05-31 16:36           ` Christoph Hellwig
2018-05-31 16:33         ` Christoph Hellwig
2018-05-31 18:17           ` Mike Snitzer
2018-06-01  2:40             ` Martin K. Petersen
2018-06-01  4:24               ` Mike Snitzer
2018-06-01 14:09                 ` Martin K. Petersen
2018-06-01 15:21                   ` Mike Snitzer
2018-06-03 11:00                 ` Sagi Grimberg
2018-06-03 16:06                   ` Mike Snitzer
2018-06-04 11:46                     ` Sagi Grimberg
2018-06-04 12:48                       ` Johannes Thumshirn
2018-05-30 22:44       ` Mike Snitzer
2018-05-31  8:51         ` Sagi Grimberg
2018-05-31 12:41           ` Mike Snitzer
2018-06-04 21:58       ` Roland Dreier
2018-06-05  4:42         ` Christoph Hellwig
2018-06-05 22:57           ` Roland Dreier
2018-06-06  9:51             ` Christoph Hellwig
2018-06-06  9:32           ` Sagi Grimberg
2018-06-06  9:50             ` Christoph Hellwig
2018-05-25 14:22   ` Johannes Thumshirn
2018-05-25 14:30     ` Christoph Hellwig

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