On Fri, Feb 20, 2015 at 06:23:32PM -0800, Jesse Gross wrote: > On Fri, Feb 20, 2015 at 4:36 PM, Ben Pfaff <b...@nicira.com> wrote: > > On Fri, Feb 20, 2015 at 04:03:21PM -0800, Jesse Gross wrote: > >> On Fri, Feb 20, 2015 at 3:46 PM, Ben Pfaff <b...@nicira.com> wrote: > >> > *** Tunnel encapsulation to publish. > >> > > >> > We can probably default to GRE. VXLAN is more modern but it only > >> > has a 24-bit key. STT has a 64-bit key but it's not ubiquitously > >> > available. > >> > >> What does ubiquitously available mean in this context? Of the tunnels > >> we have available (GRE, VXLAN, STT, Geneve), GRE seems a bit of an odd > >> choice since I think for most sets of constraints you could choose one > >> that is a better fit. (Even Microsoft is moving away from it for > >> network virtualization.) > > > > I only mean that people have to compile a new kernel module to use > > STT. > > > > What tunnel type do you recommend? > > I guess it depends on how important absolute maximum performance is on > the majority of existing hardware. If we're trying to really push > things to the limit, then it's hard to beat STT. Personally, I hope > that given where we are in the evolution of things and that OVN is > still a little future looking that STT isn't really necessary. > Possibly an option but not the default. > > GRE seems suboptimal to me due to the lack of ECMP support and not > great hardware support (even if it is present in the chip, it is less > exposed externally). > > VXLAN vs. Geneve are pretty much the same for the basic feature set > including hardware offload and ECMP. Obviously Geneve gives you more > space and choice for future extensibility. It's not quite ubiquitous > yet but the next release of Ubuntu will have kernel support out of the > box and expanded OVS userspace support should hopefully be fleshed out > more shortly, so I think all of that is OK for the OVN timeline. > > But you already knew what I was going to say, right? :)
Yeah ;-) We want OVN to support hardware VTEPs. Has there been any work with hardware switch vendors toward Geneve support? Do you think it's likely? _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
