From: Jason Wang <jasowang@redhat.com>
To: aliguori@amazon.com, mst@redhat.com, qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Jason Wang <jasowang@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] virtio-net: calculate proper msix vectors on init
Date: Fri, 21 Feb 2014 16:50:16 +0800 [thread overview]
Message-ID: <53071348.8010808@redhat.com> (raw)
In-Reply-To: <1392958857-10965-1-git-send-email-jasowang@redhat.com>
On 02/21/2014 01:00 PM, Jason Wang wrote:
> Currently, the default msix vectors for virtio-net-pci is 3 which is
> obvious not suitable for multiqueue guest, so we depends on the user
> or management tools to pass a correct vectors parameter. In fact, we
> can simplifying this by calculate the number of vectors on init.
>
> Consider we have N queues, the number of vectors needed is 2*N + 2
> (plus one config interrupt and control vq). We didn't check whether or
> not host support control vq because it was added unconditionally by
> qemu to avoid breaking legacy guests such as Minix.
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
Unnecessary debug line was found, will send V2.
next prev parent reply other threads:[~2014-02-21 8:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-21 5:00 [Qemu-devel] [PATCH] virtio-net: calculate proper msix vectors on init Jason Wang
2014-02-21 8:50 ` Jason Wang [this message]
2014-02-23 6:34 ` Michael S. Tsirkin
2014-02-24 4:58 ` Jason Wang
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