linux-kernel - Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device

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Message-ID: <CAJSP0QWaS--gPZ=ONFrXby1DQLw4R0RCro7bpHCdmucyjmqT_w@mail.gmail.com>
Date:	Tue, 17 Jun 2014 10:40:56 +0800
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, linux-api@...r.kernel.org,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	Stefan Hajnoczi <stefanha@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per
 virtio-blk device

On Sat, Jun 14, 2014 at 1:29 AM, Ming Lei <ming.lei@...onical.com> wrote:
> Firstly this patch supports more than one virtual queues for virtio-blk
> device.
>
> Secondly this patch maps the virtual queue to blk-mq's hardware queue.
>
> With this approach, both scalability and performance problem can be improved.
>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
>  drivers/block/virtio_blk.c |   75 ++++++++++++++++++++++++++++++++------------
>  1 file changed, 55 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index f63d358..e0d077d 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -16,6 +16,8 @@
>
>  #define PART_BITS 4
>
> +#define MAX_NUM_VQ 16

It would be nice to allocate virtqueues dynamically instead of
hardcoding the limit.  virtio-scsi also allocates virtqueues
dynamically.

Stefan
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