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From: keith.busch@intel.com (Keith Busch)
Subject: Why NVMe MSIx vectors affinity set across NUMA nodes?
Date: Mon, 22 Jan 2018 11:20:17 -0700	[thread overview]
Message-ID: <20180122182017.GO12043@localhost.localdomain> (raw)
In-Reply-To: <CAKTKpr68UnMAv2ePu7P3Gv8--av7hei16cygCnVcCdABfNb51Q@mail.gmail.com>

On Mon, Jan 22, 2018@11:42:45PM +0530, Ganapatrao Kulkarni wrote:
> 
> AFAIK, usually drivers sets default affinity and it is likely be node
> affinity for NUMA systems.
> Later, it is the user-space(like irqbalance etc) which decides the
> affinity not the driver.

Relying on userspace to provide an optimal setting is a bad idea,
especially for NVMe where we have submission queue cpu affinity that
doesn't work very efficiently if the completion affinity doesn't match.

  reply	other threads:[~2018-01-22 18:20 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-22  4:25 Why NVMe MSIx vectors affinity set across NUMA nodes? Ganapatrao Kulkarni
2018-01-22 17:14 ` Keith Busch
2018-01-22 17:22   ` Ganapatrao Kulkarni
2018-01-22 17:32     ` Keith Busch
2018-01-22 17:55       ` Ganapatrao Kulkarni
2018-01-22 18:05         ` Keith Busch
2018-01-22 18:12           ` Ganapatrao Kulkarni
2018-01-22 18:20             ` Keith Busch [this message]
2018-01-23 13:30               ` Sagi Grimberg
2018-01-24  2:17                 ` Ganapatrao Kulkarni
2018-01-24 15:48                   ` Keith Busch
2018-01-24 19:39                     ` Sagi Grimberg
2018-01-24 20:38                       ` Keith Busch

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