Normal setup is 1500 on the VM 9000 on br-tun 9000 on the nic
Best I can tell there shouldn’t be fragmentation am I missing something ? I have even taken the Guest MTU down to 1400 Just to be sure with no change. thanks for the help Jesse. Keep in mind VM-VM on the same node is 10Gig with a 1500 Byte MTU so it's not the guest OS that needs tuned I wouldn't think,. -----Original Message----- From: Jesse Gross [mailto:[email protected]] Sent: Monday, April 28, 2014 2:32 PM To: Lopez, James Cc: [email protected] Subject: Re: [ovs-discuss] Overlay Issues On Mon, Apr 28, 2014 at 1:37 PM, Lopez, James <[email protected]> wrote: > Team, I am working through an issue with OVS and tunneling. My setup > consist of 2 nodes running Ubuntu 12.04 LTS / KVM / OVS 1.10 and the > Mellanox Connect X3 , and 2 nodes running Ubuntu 12.04 LTS / KVM / > OVS 1.10 and the Mellanox Connect X3 Pro. Currently I am seeing an > 85% reduction of throughput VM-VM using iperf vs the same iperf test > running on the nodes br-tun to br-tun… ConnectX3 and ConnectX3 Pro > show the exact same results , also although VXLAN performance is > slightly better it still shows the same 85% reduction. > > > > I can clear this up by adjusting the MTU’s > > > > 7000 on the VM > > 8000 on the br-tun > > 9000 on the nic > > > > Is this expected behavior ? Any help is greatly appreciated. Yes, if there is fragmentation then that will greatly reduce performance. Founded in 2007, IO is a worldwide leader in software defined data center technology, services and solutions that enable businesses and governments to intelligently control their information. The communication contained in this e-mail is confidential and is intended only for the named recipient(s) and may contain information that is privileged, proprietary, attorney work product or exempt from disclosure under applicable law. If you have received this message in error, or are not the named recipient(s), please note that any form of distribution, copying or use of this communication or the information in it is strictly prohibited and may be unlawful. Please immediately notify the sender of the error, and delete this communication including any attached files from your system. Thank you for your cooperation. _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
