From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH 0/3] Provide more fine grained control over multipathing
Date: Tue, 5 Jun 2018 06:42:23 +0200 [thread overview]
Message-ID: <20180605044222.GA29384@lst.de> (raw)
In-Reply-To: <CAL1RGDV0eT4juuMwHWkjqc2oTsk-CHRJ0A90veXxLsVZYa5esQ@mail.gmail.com>
On Mon, Jun 04, 2018@02:58:49PM -0700, Roland Dreier wrote:
> We plan to implement all the fancy NVMe standards like ANA, but it
> seems that there is still a requirement to let the host side choose
> policies about how to use paths (round-robin vs least queue depth for
> example). Even in the modern SCSI world with VPD pages and ALUA,
> there are still knobs that are needed. Maybe NVMe will be different
> and we can find defaults that work in all cases but I have to admit
> I'm skeptical...
The sensible thing to do in nvme is to use different paths for
different queues. That is e.g. in the RDMA case use the HCA closer
to a given CPU by default. We might allow to override this for
cases where the is a good reason, but what I really don't want is
configurability for configurabilities sake.
next prev parent reply other threads:[~2018-06-05 4:42 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-25 12:53 [PATCH 0/3] Provide more fine grained control over multipathing 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
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 [this message]
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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