Re: [PATCH v5 4/9] scsi: use block layer helpers to calculate num of queues

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To: Daniel Wagner <wagi@xxxxxxxxxx>
Subject: Re: [PATCH v5 4/9] scsi: use block layer helpers to calculate num of queues
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Fri, 10 Jan 2025 16:37:24 -0500
Cc: Jens Axboe <axboe@xxxxxxxxx>, Keith Busch <kbusch@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Sagi Grimberg <sagi@xxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Costa Shulyupin <costa.shul@xxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Valentin Schneider <vschneid@xxxxxxxxxx>, Waiman Long <llong@xxxxxxxxxx>, Ming Lei <ming.lei@xxxxxxxxxx>, Frederic Weisbecker <frederic@xxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxx>, Hannes Reinecke <hare@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, megaraidlinux.pdl@xxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, storagedev@xxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, GR-QLogic-Storage-Upstream@xxxxxxxxxxx
In-reply-to: <20250110-isolcpus-io-queues-v5-4-0e4f118680b0@kernel.org> (Daniel Wagner's message of "Fri, 10 Jan 2025 17:26:42 +0100")
Organization: Oracle Corporation
References: <20250110-isolcpus-io-queues-v5-0-0e4f118680b0@kernel.org> <20250110-isolcpus-io-queues-v5-4-0e4f118680b0@kernel.org>

Daniel,

> Multiqueue devices should only allocate queues for the housekeeping CPUs
> when isolcpus=managed_irq is set. This avoids that the isolated CPUs get
> disturbed with OS workload.

Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>

-- 
Martin K. Petersen	Oracle Linux Engineering

References:
- [PATCH v5 0/9] blk: honor isolcpus configuration
  - From: Daniel Wagner
- [PATCH v5 4/9] scsi: use block layer helpers to calculate num of queues
  - From: Daniel Wagner

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