netdev - Re: [RFC] Virtual Machine Device Queues(VMDq) support on KVM

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Date:	Tue, 22 Sep 2009 09:29:57 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org,
	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hpa@...or.com" <hpa@...or.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [RFC] Virtual Machine Device Queues(VMDq) support on KVM

On Tue, 22 Sep 2009 13:50:54 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> On Tuesday 22 September 2009, Michael S. Tsirkin wrote:
> > > > More importantly, when virtualizations is used with multi-queue
> > > > NIC's the virtio-net NIC is a single CPU bottleneck. The virtio-net
> > > > NIC should preserve the parallelism (lock free) using multiple
> > > > receive/transmit queues. The number of queues should equal the
> > > > number of CPUs.
> > > 
> > > Yup, multiqueue virtio is on todo list ;-)
> > > 
> > 
> > Note we'll need multiqueue tap for that to help.
> 
> My idea for that was to open multiple file descriptors to the same
> macvtap device and let the kernel figure out the  right thing to
> do with that. You can do the same with raw packed sockets in case
> of vhost_net, but I wouldn't want to add more complexity to the
> tun/tap driver for this.
> 
> 	Arnd <><


Or get tap out of the way entirely. The packets should not have
to go out to user space at all (see veth)
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