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

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Message-ID: <20090921092130.30984dbd@s6510>
Date:	Mon, 21 Sep 2009 09:21:30 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	virtualization@...ts.linux-foundation.org,
	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mst@...hat.com" <mst@...hat.com>,
	"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, 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.
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