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From: Keith Busch <keith.busch@intel.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>,
	Jianchao Wang <jianchao.w.wang@oracle.com>,
	axboe@fb.com, sagi@grimberg.me, linux-kernel@vger.kernel.org,
	linux-nvme@lists.infradead.org
Subject: Re: [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0
Date: Thu, 1 Mar 2018 09:10:42 -0700	[thread overview]
Message-ID: <20180301161042.GA14799@localhost.localdomain> (raw)
In-Reply-To: <20180301150329.GB6795@ming.t460p>

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.

WARNING: multiple messages have this Message-ID (diff)
From: keith.busch@intel.com (Keith Busch)
Subject: [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0
Date: Thu, 1 Mar 2018 09:10:42 -0700	[thread overview]
Message-ID: <20180301161042.GA14799@localhost.localdomain> (raw)
In-Reply-To: <20180301150329.GB6795@ming.t460p>

On Thu, Mar 01, 2018@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.

  reply	other threads:[~2018-03-01 16:08 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 15:48 [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0 Jianchao Wang
2018-02-28 15:48 ` Jianchao Wang
2018-02-28 15:59 ` Andy Shevchenko
2018-02-28 15:59   ` Andy Shevchenko
2018-03-02  3:06   ` jianchao.wang
2018-03-02  3:06     ` jianchao.wang
2018-03-12 18:59     ` Keith Busch
2018-03-12 18:59       ` Keith Busch
2018-03-13  1:47       ` jianchao.wang
2018-03-13  1:47         ` jianchao.wang
2018-02-28 16:47 ` Christoph Hellwig
2018-02-28 16:47   ` Christoph Hellwig
2018-03-01  9:28   ` Sagi Grimberg
2018-03-01  9:28     ` Sagi Grimberg
2018-03-01 10:05     ` jianchao.wang
2018-03-01 10:05       ` jianchao.wang
2018-03-01 15:15       ` Keith Busch
2018-03-01 15:15         ` Keith Busch
2018-03-02  3:11         ` jianchao.wang
2018-03-02  3:11           ` jianchao.wang
2018-03-01 15:03   ` Ming Lei
2018-03-01 15:03     ` Ming Lei
2018-03-01 16:10     ` Keith Busch [this message]
2018-03-01 16:10       ` Keith Busch
2018-03-08  7:42       ` Christoph Hellwig
2018-03-08  7:42         ` Christoph Hellwig
2018-03-09 17:24         ` Keith Busch
2018-03-09 17:24           ` Keith Busch
2018-03-12  9:09           ` Ming Lei
2018-03-12  9:09             ` Ming Lei
2018-10-08  5:05             ` nvme-pci: number of queues off by one Prasun Ratn
2018-10-08  5:59               ` Dongli Zhang
2018-10-08  5:59                 ` Dongli Zhang
2018-10-08  6:58                 ` Dongli Zhang
2018-10-08  6:58                   ` Dongli Zhang
2018-10-08 14:54                   ` Keith Busch
2018-10-08 14:54                     ` Keith Busch
2018-10-08 10:19                 ` Ming Lei
2018-10-08 10:19                   ` Ming Lei
2018-03-02  3:18   ` [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0 jianchao.wang
2018-03-02  3:18     ` jianchao.wang

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