From: Christoph Hellwig <hch@lst.de>
To: luferry <luferry@163.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Dongli Zhang <dongli.zhang@oracle.com>,
Ming Lei <ming.lei@redhat.com>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] make blk_mq_map_queues more friendly for cpu topology
Date: Wed, 27 Mar 2019 09:16:19 +0100 [thread overview]
Message-ID: <20190327081619.GG20525@lst.de> (raw)
In-Reply-To: <48ca2186.fc76.169b8fef63a.Coremail.luferry@163.com>
On Tue, Mar 26, 2019 at 03:55:10PM +0800, luferry wrote:
>
>
>
> At 2019-03-26 15:39:54, "Christoph Hellwig" <hch@lst.de> wrote:
> >Why isn't this using the automatic PCI-level affinity assignment to
> >start with?
>
> When enable virtio-blk with multi queues but with only 2 msix-vector.
> vp_dev->per_vq_vectors will be false, vp_get_vq_affintity will return NULL directly
> so blk_mq_virtio_map_queues will fallback to blk_mq_map_queues.
What is the point of the multiqueue mode if you don't have enough
(virtual) MSI-X vectors?
next prev parent reply other threads:[~2019-03-27 8:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 15:26 [PATCH] make blk_mq_map_queues more friendly for cpu topology luferry
2019-03-26 7:39 ` Christoph Hellwig
2019-03-26 7:55 ` luferry
2019-03-27 8:16 ` Christoph Hellwig [this message]
2019-03-27 9:17 ` luferry
2019-03-27 9:39 ` Dongli Zhang
2019-03-27 9:53 ` luferry
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