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.
next prev parent 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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