linux-kernel - Re: [PATCH 5/5] virtio-scsi: introduce multiqueue support

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Message-ID: <20120904144754.GO9805@redhat.com>
Date:	Tue, 4 Sep 2012 17:47:54 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	kvm@...r.kernel.org, rusty@...tcorp.com.au, jasowang@...hat.com,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 5/5] virtio-scsi: introduce multiqueue support

On Tue, Aug 28, 2012 at 01:54:17PM +0200, Paolo Bonzini wrote:
> @@ -575,15 +630,19 @@ static struct scsi_host_template virtscsi_host_template = {
>  				  &__val, sizeof(__val)); \
>  	})
>  
> +

Pls don't add empty lines.

>  static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
> -			     struct virtqueue *vq)
> +			     struct virtqueue *vq, bool affinity)
>  {
>  	spin_lock_init(&virtscsi_vq->vq_lock);
>  	virtscsi_vq->vq = vq;
> +	if (affinity)
> +		virtqueue_set_affinity(vq, virtqueue_get_queue_index(vq) -
> +				       VIRTIO_SCSI_VQ_BASE);
>  }
>  

This means in practice if you have less virtqueues than CPUs,
things are not going to work well, will they?

Any idea what to do?

-- 
MST
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