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." Chris ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
