From: Keith Busch <kbusch@kernel.org>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: bigeasy@linutronix.de, ming.lei@redhat.com, tglx@linutronix.de,
linux-nvme@lists.infradead.org, hch@lst.de
Subject: Re: [PATCHv3 2/4] nvme/pci: Complete commands from primary handler
Date: Thu, 12 Dec 2019 10:02:40 +0900 [thread overview]
Message-ID: <20191212010240.GA29574@redsun51.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <79442e8d-719a-7510-deea-cc23694fdec0@grimberg.me>
On Wed, Dec 11, 2019 at 04:40:47PM -0800, Sagi Grimberg wrote:
> > Perhaps we can cycle the effective_affinity through the smp_affinity?
>
> Not sure I follow your thoughts.
The only way the nvme driver's interrupt handler can saturate a
cpu requires the smp_affinity have multiple online cpus set. The
effective_affinity, however, is always a single cpu, which can be any
of the online ones set in smp_affinity.
If we can detect a cpu is spending too many cycles in nvme irq,
perhaps we can re-spread the effective_affinity to different cpus. I
don't currently know of a good way to do this, though.
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next prev parent reply other threads:[~2019-12-12 1:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 17:56 [PATCHv3 0/4] nvme pci interrupt handling improvements Keith Busch
2019-12-09 17:56 ` [PATCHv3 1/4] nvme/pci: Disable interrupts for threaded handler Keith Busch
2019-12-10 15:12 ` Daniel Wagner
2019-12-10 15:28 ` Sebastian Andrzej Siewior
2019-12-10 15:54 ` Keith Busch
2019-12-10 16:44 ` Daniel Wagner
2019-12-10 16:57 ` Keith Busch
2019-12-10 17:11 ` Daniel Wagner
2019-12-12 9:09 ` Christoph Hellwig
2019-12-12 15:53 ` Keith Busch
2019-12-09 17:56 ` [PATCHv3 2/4] nvme/pci: Complete commands from primary handler Keith Busch
2019-12-10 20:00 ` Sagi Grimberg
2019-12-10 20:25 ` Keith Busch
2019-12-10 21:14 ` Sagi Grimberg
2019-12-11 17:35 ` Keith Busch
2019-12-12 0:40 ` Sagi Grimberg
2019-12-12 1:02 ` Keith Busch [this message]
2019-12-12 22:55 ` Ming Lei
2019-12-12 23:30 ` Keith Busch
2019-12-13 0:52 ` Ming Lei
2019-12-12 9:14 ` Christoph Hellwig
2019-12-09 17:56 ` [PATCHv3 3/4] nvme/pci: Remove use_threaded_interrupts Keith Busch
2019-12-12 9:14 ` Christoph Hellwig
2019-12-12 15:45 ` Keith Busch
2019-12-18 7:29 ` Ming Lei
2019-12-18 15:50 ` Keith Busch
2019-12-19 1:10 ` Ming Lei
2019-12-09 17:56 ` [PATCHv3 4/4] nvme/pci: Poll threaded completions Keith Busch
2019-12-10 17:43 ` Daniel Wagner
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