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Date:	Fri, 3 Aug 2012 18:49:23 +0100
From:	Ben Hutchings <>
To:	John Fastabend <>
CC:	Jay Vosburgh <>,
	Chris Friesen <>,
	netdev <>
Subject: Re: [E1000-devel] discussion questions: SR-IOV, virtualization, and

On Thu, 2012-08-02 at 21:50 -0700, John Fastabend wrote:
> On 8/2/2012 4:01 PM, Jay Vosburgh wrote:
> > 	Still, though, isn't "influence the guest's choice" pretty much
> > satisified by having the VF interface go carrier down in the guest when
> > the host wants it to?  Or are you thinking about more fine grained than
> > that?
> >
> Perhaps one argument against this is if the hardware supports loopback
> modes or the edge relay in the hardware is acting like a VEB it may
> still be possible to support VF to VF traffic even if the external link
> is down. Not sure how useful this is though or if any existing hardware
> even supports it.

It seems to me that VF to VF traffic ought to still work.  If it doesn't
then that's an unfortunate regression when moving from software bridging
and virtio to hardware-supported network virtualisation.  (But hybrid
network virtualisation may help to solve that.)


Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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