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From: Ming Lei <ming.lei@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Keith Busch <kbusch@kernel.org>, Keith Busch <kbusch@meta.com>,
	linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts
Date: Tue, 21 May 2024 10:31:59 +0800	[thread overview]
Message-ID: <ZkwHnw6HkGFFq7mR@fedora> (raw)
In-Reply-To: <20240520153742.GB921@lst.de>

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.

isolcpus=	[KNL,SMP,ISOL] Isolate a given set of CPUs from disturbance.
			[Deprecated - use cpusets instead]



Thanks, 
Ming



  parent reply	other threads:[~2024-05-21  2:32 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 [this message]
2024-05-21  8:38                 ` Thomas Gleixner
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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