Hi Han, Thanks for your input - much appreciated. I will try and reproduce their results.
Regards Kristoffer On 31/07/2014, at 11.23.07, Han Zhou <zhou...@gmail.com> wrote: > Hi Kristoffer, > > Sorry for late response. > > On Tue, Jul 29, 2014 at 4:30 PM, Kristoffer Egefelt <kristof...@itoc.dk> > wrote: >> I actually asked them: >> http://lists.opencontrail.org/pipermail/users_lists.opencontrail.org/2014-July/000338.html >> >> As I understood it, they are able to offload from VM to VM, without >> segmentation - maybe I’m wroing, and what actually is happening is that >> their vrouter module, on the receiving side, is able to reassemble the >> packets to 64k before sending to the vif. >> This reassembly I cannot reproduce with OVS. >> Maybe this is how they reach the 9.18Gbps ? >> > > In fact the optimization I mentioned to VXLAN was similar in the way > you described. > Earlier discussion in OVS community: > http://openvswitch.org/pipermail/discuss/2014-May/013981.html > > The OVS patch in my Github: > https://github.com/hzhou8/openvswitch/commit/9a7deb8b432ce83a9c09d7d4ff85fa050f7dd2be > > RFC draft: > http://tools.ietf.org/html/draft-zhou-li-vxlan-soe-01 > > However this cannot achieve 9+ Gbits/sec for a single flow. It was > around 2.5 times increase from 2.6G to 6.7G. > Linux kernel had an optimization for GRO and GSO for UDP tunnels, > VXLAN is one use case. Should be similar in GRE tunnels. The approach > is different but performance gains are similar, because all these > solutions are to reassemble in receiving host to avoid small packet to > RX VMs. > > Back to the OpenContrail case, I think they might be using multiple > flows instead of one to achieve 9+ Gbits/sec. Without hardware > acceleration (disable TSO/GRO on NIC), even with baremetal we can only > achieve 6+ Gbits/sec with a single flow. So I don't believe the > software offloading of vRouter can compete NIC acceleration. > > Best regards, > Han > _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
