From: Sasha Levin <levinsasha928@gmail.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: netdev@vger.kernel.org, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCHv3] virtio-spec: virtio network device multiqueue support
Date: Fri, 07 Sep 2012 02:17:08 +0200 [thread overview]
Message-ID: <50493D04.1090408@gmail.com> (raw)
In-Reply-To: <20120906120828.GA1534@redhat.com>
Hi Michael,
On 09/06/2012 02:08 PM, Michael S. Tsirkin wrote:
> Add multiqueue support to virtio network device.
> Add a new feature flag VIRTIO_NET_F_MULTIQUEUE for this feature, a new
> configuration field max_virtqueue_pairs to detect supported number of
> virtqueues as well as a new command VIRTIO_NET_CTRL_STEERING to program
> packet steering.
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Some comments about the change:
- "The following four read-only fields only exists if VIRTIO_NET_F_MULTIQUEUE
is set." => Should be "exist" (I think).
- "When rule is set to VIRTIO_NET_CTRL_STEERING_RX_FOLLOWS_TX packets are
steered by driver to the first (param+1) multiqueue virtqueues
transmitq1...transmitqN;" - Why param+1? I thought we ignore the default
transmit/receive in this case.
- "As selecting a specific steering ais n optimization feature" - "is an".
- It's mentioned several times that the ability to read the steering rule from
the virtio-net config is there for debug reasons. Is it really necessary? I
think it's the first time I see debug features go in as part of the spec.
- I'm slightly confused, why are there both receive and transmit steering? I
can't find a difference in the way to configure the rule for transmit and
receive. Is it a plan for the future to allow different rules for tx and rx? If
so, shouldn't we use different ctrl commands (
VIRTIO_NET_CTRL_TX_STEERING/VIRTIO_NET_CTRL_RX_STEERING)?
- "When rule is set to VIRTIO_NET_CTRL_STEERING_SINGLE all packets are steered
to the default virtqueue receveq (0);" - "receiveq (0)"
Thanks,
Sasha
next prev parent reply other threads:[~2012-09-07 0:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-06 12:08 [PATCHv3] virtio-spec: virtio network device multiqueue support Michael S. Tsirkin
2012-09-06 16:43 ` Paolo Bonzini
2012-09-06 23:16 ` Michael S. Tsirkin
2012-09-07 0:17 ` Sasha Levin [this message]
2012-09-07 0:26 ` Michael S. Tsirkin
2012-09-09 12:40 ` Michael S. Tsirkin
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