From: roland@purestorage.com (Roland Dreier)
Subject: [PATCH 0/3] Provide more fine grained control over multipathing
Date: Tue, 5 Jun 2018 15:57:05 -0700 [thread overview]
Message-ID: <CAL1RGDWvxcz7zAoEa-Ukhmsn=Vuj6O07X666BK+vJOdkA7qwNQ@mail.gmail.com> (raw)
In-Reply-To: <20180605044222.GA29384@lst.de>
> 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.
That makes sense but I'm not sure it covers everything. Probably the
most common way to do NVMe/RDMA will be with a single HCA that has
multiple ports, so there's no sensible CPU locality. On the other
hand we want to keep both ports to the fabric busy. Setting different
paths for different queues makes sense, but there may be
single-threaded applications that want a different policy.
I'm not saying anything very profound, but we have to find the right
balance between too many and too few knobs.
- R.
next prev parent reply other threads:[~2018-06-05 22:57 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
2018-06-05 22:57 ` Roland Dreier [this message]
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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