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From: Thomas Gleixner <tglx@linutronix.de>
To: Ming Lei <ming.lei@redhat.com>, Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <kbusch@kernel.org>, Keith Busch <kbusch@meta.com>,
	linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org,
	Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts
Date: Tue, 21 May 2024 10:38:25 +0200	[thread overview]
Message-ID: <87a5kjimpq.ffs@tglx> (raw)
In-Reply-To: <ZkwHnw6HkGFFq7mR@fedora>

On Tue, May 21 2024 at 10:31, Ming Lei wrote:

> On Mon, May 20, 2024 at 05:37:42PM +0200, Christoph Hellwig wrote:
>> On Sun, May 12, 2024 at 08:35:55AM +0200, Thomas Gleixner wrote:
>> > That's expected as you pin the I/O operation on the isolated CPUs which
>> > in turn makes them use the per CPU queue.
>> > 
>> > The isolated CPUs are only excluded for device management interrupts,
>> > but not for the affinity spread of the queues.
>> 
>> We'll probably need a version of isolcpus that also excludes the
>> interrupt spread given that users are asking for it.  And I'd much
>> prefer that over adding radom module options to every driver to disable
>> managed interrupts.
>
> BTW, isolcpus has been marked as deprecated, and it can't be adjust
> runtime.

Which is far from reality as cpusets do not allow to do what isolcpus
does today.

Also runtime adjusting managed interrupts needs way more thoughts.

Thanks

        tglx

  reply	other threads:[~2024-05-21  8:38 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-10 14:14 [PATCH 1/2] genirq/affinity: remove rsvd check against minvec Keith Busch
2024-05-10 14:14 ` [PATCH 2/2] nvme-pci: allow unmanaged interrupts Keith Busch
2024-05-10 15:10   ` Christoph Hellwig
2024-05-10 16:20     ` Keith Busch
2024-05-10 23:50       ` Ming Lei
2024-05-11  0:41         ` Keith Busch
2024-05-11  0:59           ` Ming Lei
2024-05-12  6:35           ` Thomas Gleixner
2024-05-20 15:37             ` Christoph Hellwig
2024-05-20 20:34               ` Thomas Gleixner
2024-05-21  2:31               ` Ming Lei
2024-05-21  8:38                 ` Thomas Gleixner [this message]
2024-05-21 10:06                   ` Frederic Weisbecker
2024-05-13  7:33     ` Benjamin Meier
2024-05-13  8:39       ` Ming Lei
2024-05-13  8:59         ` Benjamin Meier
2024-05-13  9:25           ` Ming Lei
2024-05-13 12:33             ` Benjamin Meier
2024-05-13 13:12     ` Bart Van Assche
2024-05-10 15:15 ` [PATCH 1/2] genirq/affinity: remove rsvd check against minvec Ming Lei
2024-05-10 16:47   ` Keith Busch

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