linux-kernel - Re: [PATCH] nvme: use the correct msix vector for each queue

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Message-ID: <20161207224627.GA16018@infradead.org>
Date:   Wed, 7 Dec 2016 14:46:28 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Dan Streetman <ddstreet@...e.org>, Jens Axboe <axboe@...com>,
        Dan Streetman <dan.streetman@...onical.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH] nvme: use the correct msix vector for each queue

On Wed, Dec 07, 2016 at 05:49:42PM -0500, Keith Busch wrote:
> I'm just saying that blk-mq's hctx mapping will end up choosing a queue
> who's vector is mapped to a different CPU, and we don't want that.

Right.  For 4.10 we could use the pci_alloc_irq_vectors_affinity helper
to set away a pre_vector IFF we want a separate vector for the admin
queue.

> We are currently sharing the first IO queue's interrupt vector with
> the admin queue's on purpose. Are you saying there's something wrong
> with that?

But given that the sharing was done intentionally and we had a long
discussion on it back then there should be no real reason to change
the assignment in NVMe.