Hi Erik, Thanks for the post. Do you by any chance have any data on impact of packet loss on STT performance if application is running TCP? Would the application resend the entire segment!?
Thanks, Siamack From: [email protected] [mailto:[email protected]] On Behalf Of smith, erik Sent: Wednesday, August 29, 2012 6:48 PM To: David LE GOFF; [email protected] Subject: Re: [nvo3] performance limitations with virtual switch as the nvo3 end point Hi David, a few months ago we did some basic performance testing with OVS and were pretty happy with the results. For one reason or another we were under the impression that using OVS to encap/decap would limit our total throughput to 4-6 Gbps and this turned out to not be the case. In our configuration, we were able to demonstrate 20 Gbps over a bonded pair of 10GbE NICs using STT for the overlay. Our testing wasn't exactly scientific but I also found an interesting blog post by Martin Cassado that our limited testing seems to corroborate. I haven't done any testing with VMware and VXLAN. However, if you're experiencing limited performance with OVS on <insert your favorite Linux distro here>, I would suggest playing around with Jumbo frames (starting from within the guest) and working your way out to the physical interfaces. For additional information, refer to the following: 1) Martin Cassado's blog: ( http://networkheresy.com/2012/06/08/the-overhead-of-software-tunneling/ ) 2) I posted something to my blog a bit less detailed (but with diagrams) earlier this week ( http://brasstacksblog.typepad.com/brass-tacks/2012/08/network-virtualization-networkings-21st-century-equivalent-to-the-space-race.html ) Specifically, the final three diagrams.. Erik From: [email protected] [mailto:[email protected]] On Behalf Of David LE GOFF Sent: Wednesday, August 29, 2012 9:16 AM To: [email protected] Subject: [nvo3] performance limitations with virtual switch as the nvo3 end point Hi Folks, Did anyone experienced some performance limitations in Labs with the virtual switch function as the bottleneck when dealing with network overlays? I mean with the tunnel end point located on the hypervisor (virtual switch), setting up Tagging, QoS, ACL, encryption/decryption, etc. require significant CPUs. I know there is not yet official nvo3 implementation there, though VSphere 5 announced it with VXLAN recently but at any chance if some studies have been done, I would be glad to read those. I know STT has been built to overcome such challenges thanks to the NIC offload capabilities... These studies may also drive the brainstorming about which protocol we may use/build? Thank you! david le goff.
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