Re: [E1000-devel] discussion questions: SR-IOV, virtualization, and bonding

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On 08/03/2012 11:49 AM, Ben Hutchings wrote:
On Thu, 2012-08-02 at 21:50 -0700, John Fastabend wrote:

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.)

I would have thought this to be desirable as well. Apparently the Intel engineers disagreed. The 82599 datasheet has the following:

"Loopback is disabled when the network link is disconnected. It is expected (but not required) that system software (including VMs) does not post packets for transmission when the link is disconnected. Note that packets posted by system software for transmission when the link is down are buffered."

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