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

From: "Michael S. Tsirkin" <[email-masked]>
Date: Tue, 22 Sep 2009 13:38:07 +0300

On Mon, Sep 21, 2009 at 09:27:18AM -0700, Chris Wright wrote:
> * Stephen Hemminger ([email-masked]) wrote:
> > On Mon, 21 Sep 2009 16:37:22 +0930
> > Rusty Russell <[email-masked]> 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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