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

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Date:	Tue, 22 Sep 2009 13:38:07 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	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 Mon, Sep 21, 2009 at 09:27:18AM -0700, Chris Wright wrote:
> * Stephen Hemminger (shemminger@...tta.com) wrote:
> > On Mon, 21 Sep 2009 16:37:22 +0930
> > Rusty Russell <rusty@...tcorp.com.au> wrote:
> > 
> > > > > Actually this framework can apply to traditional network adapters which have
> > > > > just one tx/rx queue pair. And applications using the same user/kernel interface
> > > > > can utilize this framework to send/receive network traffic directly thru a tx/rx
> > > > > queue pair in a network adapter.
> > > > > 
> > 
> > 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 ;-)
> 
> thanks,
> -chris

Note we'll need multiqueue tap for that to help.

-- 
MST
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