linux-kernel - Re: [PATCH v6 3/9] nvme-pci: use block layer helpers to calculate num of queues

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Message-ID: <aB1eswAv6Tz2WDpc@fedora>
Date: Fri, 9 May 2025 09:47:31 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Daniel Wagner <wagi@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Costa Shulyupin <costa.shul@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <llong@...hat.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Mel Gorman <mgorman@...e.de>, Hannes Reinecke <hare@...e.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	linux-nvme@...ts.infradead.org, megaraidlinux.pdl@...adcom.com,
	linux-scsi@...r.kernel.org, storagedev@...rochip.com,
	virtualization@...ts.linux.dev,
	GR-QLogic-Storage-Upstream@...vell.com
Subject: Re: [PATCH v6 3/9] nvme-pci: use block layer helpers to calculate
 num of queues

On Thu, Apr 24, 2025 at 08:19:42PM +0200, Daniel Wagner wrote:
> Multiqueue devices should only allocate queues for the housekeeping CPUs
> when isolcpus=io_queue is set. This avoids that the isolated CPUs get
> disturbed with OS workload.

The commit log needs to be updated:

- io_queue isn't introduced yet

- this patch can only reduce nr_hw_queues, and queue mapping isn't changed
yet, so nothing to do with

 "This avoids that the isolated CPUs get disturbed with OS workload"


Thanks, 
Ming