netdev - Re: [RFC PATCH 1/4] Add a new API to virtio-pci

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Date:	Wed, 15 Sep 2010 07:35:29 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	Krishna Kumar2 <krkumar2@...ibm.com>, davem@...emloft.net,
	kvm@...r.kernel.org, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC PATCH 1/4] Add a new API to virtio-pci

On Mon, Sep 13, 2010 at 07:00:51PM +0200, Avi Kivity wrote:
>  On 09/13/2010 06:30 PM, Michael S. Tsirkin wrote:
> >Trouble is, each vhost-net device is associated with 1 tun/tap
> >device which means that each vhost-net device is associated with a
> >transmit and receive queue.
> >
> >I don't know if you'll always have an equal number of transmit and
> >receive queues but there's certainly  challenge in terms of
> >flexibility with this model.
> >
> >Regards,
> >
> >Anthony Liguori
> >Not really, TX and RX can be mapped to different devices,
> >or you can only map one of these. What is the trouble?
> 
> Suppose you have one multiqueue-capable ethernet card.  How can you
> connect it to multiple rx/tx queues?
> tx is in principle doable, but what about rx?
> 
> What does "only map one of these" mean?  Connect the device with one
> queue (presumably rx), and terminate the others?
> 
> 
> Will packet classification work (does the current multiqueue
> proposal support it)?
> 

This is a non trivial problem, but
this needs to be handled in tap, not in vhost net.
If tap gives you multiple queues, vhost-net will happily
let you connect vqs to these.

> 
> -- 
> error compiling committee.c: too many arguments to function
> 
> --
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