linux-kernel - Re: [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0

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Message-ID: <20180301161042.GA14799@localhost.localdomain>
Date:   Thu, 1 Mar 2018 09:10:42 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Christoph Hellwig <hch@....de>,
        Jianchao Wang <jianchao.w.wang@...cle.com>, axboe@...com,
        sagi@...mberg.me, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH V2] nvme-pci: assign separate irq vectors for adminq and
 ioq0

On Thu, Mar 01, 2018 at 11:03:30PM +0800, Ming Lei wrote:
> If all CPUs for the 1st IRQ vector of admin queue are offline, then I
> guess NVMe can't work any more.

Yikes, with respect to admin commands, it appears you're right if your
system allows offlining CPU0.

> So looks it is a good idea to make admin queue's IRQ vector assigned as
> non-managed IRQs.

It'd still be considered managed even if it's a 'pre_vector', though
it would get the default mask with all possible CPUs.