[ovs-discuss] Ethernet over GRE tunneling?

Yuji IMAI kimai at labs.fujitsu.com
Thu Aug 12 00:30:39 UTC 2010


  Do you have any performance numbers open for community?

  We are just planning to compare VM to VM tunnel performance among
IPinIP/linux/Dom-U/Xen as virtual router, using gretap/linux/Dom-0 and
gre/openvSwitch/Dom-0/Xen. If you have any such performance measurements
already, we want to do them with parameters and environment as same as

Thank you in advance.

Cloud computing Laboratory

(2010/08/12 3:26), Jesse Gross wrote::
> On Wed, Aug 11, 2010 at 2:13 AM, <qzchenwl at gmail.com>  wrote:
>> What is the different with Implement GRE Protocol ?
>> Does OVS have any advanced features than GRE?
>> Is OVS able to take a broadcast packet and go through GRE tunnel and
>> broadcast in another subnet?
> GRE is a standardized protocol so there aren't really "advanced features"
> per se.  However, the Open vSwitch implementation supports a large number
> tunnels and has significantly higher performance when compared to other
> implementations.
> GRE is just tunneling Ethernet frames between switches so a broadcast packet
> will be broadcast by a remote switch, regardless of where it is.
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