Hi James, Let me ask you something...
Are you using the package `openvswitch-datapath-dkms' from Havana Ubuntu Cloud Archive with Linux 3.8? I am unable to compile that module on top of Ubuntu 12.04.3 (with Linux 3.8) and I'm wondering if it is still required or not... Thanks! Thiago On 2 October 2013 06:14, James Page <[email protected]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Hi Folks > > I'm seeing an odd direction performance issue with my Havana test rig > which I'm struggling to debug; details: > > Ubuntu 12.04 with Linux 3.8 backports kernel, Havana Cloud Archive > (currently Havana b3, OpenvSwitch 1.10.2), OpenvSwitch plugin with GRE > overlay networks. > > I've configured the MTU's on all of the physical host network > interfaces to 1546 to add capacity for the GRE network headers. > > Performance between instances within a single tenant network on > different physical hosts is as I would expect (near 1GBps), but I see > issues when data transits the Neutron L3 gateway - in the example > below churel is a physical host on the same network as the layer 3 > gateway: > > ubuntu@churel:~$ scp hardware.dump 10.98.191.103: > hardware.dump > 100% 67MB 4.8MB/s > 00:14 > > ubuntu@churel:~$ scp 10.98.191.103:hardware.dump . > hardware.dump > 100% 67MB > 66.8MB/s 00:01 > > As you can see, pushing data to the instance (via a floating ip > 10.98.191.103) is painfully slow, whereas pulling the same data is > x10+ faster (and closer to what I would expect). > > iperf confirms the same: > > ubuntu@churel:~$ iperf -c 10.98.191.103 -m > - ------------------------------------------------------------ > Client connecting to 10.98.191.103, TCP port 5001 > TCP window size: 22.9 KByte (default) > - ------------------------------------------------------------ > [ 3] local 10.98.191.11 port 55330 connected with 10.98.191.103 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 60.8 MBytes 50.8 Mbits/sec > [ 3] MSS size 1448 bytes (MTU 1500 bytes, ethernet) > > ubuntu@james-page-bastion:~$ iperf -c 10.98.191.11 -m > > > - ------------------------------------------------------------ > Client connecting to 10.98.191.11, TCP port 5001 > TCP window size: 23.3 KByte (default) > - ------------------------------------------------------------ > [ 3] local 10.5.0.2 port 52190 connected with 10.98.191.11 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 1.07 GBytes 918 Mbits/sec > [ 3] MSS size 1448 bytes (MTU 1500 bytes, ethernet) > > > 918Mbit vs 50Mbits. > > I tcpdump'ed the traffic and I see alot of duplicate acks which makes > me suspect some sort of packet fragmentation but its got me puzzled. > > Anyone have any ideas about how to debug this further? or has anyone > seen anything like this before? > > Cheers > > James > > > - -- > James Page > Ubuntu and Debian Developer > [email protected] > [email protected] > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.14 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQIcBAEBCAAGBQJSS+QSAAoJEL/srsug59jD8ZcQAKbZDVU8KKa7hsic7+ulqWQQ > EFbq8Im5x4mQY7htIvIOM26BR0ktAO5luE7zMBXsA4AwPud1BQSGhw89/NvNhADT > TLcGdQADsomeiBpJebzwUmvL/tYUoMDRA3O96mUn2pi0fySWbEuEgMDjDJ/ow23D > Y7nEv0mItaZ4MBSI9RZcqsDUl7UbbdlGejSWhJcwp/127HMU9nYwWNz5UHJjsGZ1 > eITyv1WZH/dYPQ1SES41qD1WvkTBugopGJvptEyrcO62A+akGOvnqpsHgPECbLb+ > b/8rk8nB1HB74Wh+tQP4WRQCZYso15nB6ukIyIU24Qti2tXtXDdKwszEoblCwCT3 > YZJTERNOENURlUEFwgi6FNL+nZomSG0UJU6qqDGiUJkbSF7SwJm4y8/XRlJM2Ihn > wyxFB0qe3YdMqgDLZn11GwCDqn3g11hYaocHNUyRaj/tgxhGKbOFvix5kz3I4V7T > gd+sqUySMVd9wCRXBzDDhCuG9xf/QY2ZQxXzyfPJWd9svPh/O6osTSQzaI1eZl9/ > jVRejMAFr6Rl11GPKd3DYi32GXa896QELjBmJ9Kof0NDlCcDuUKpVeifIhcbQZZV > sWyQmbb6Z/ypFV9xXiLRfH2fW2bAQQHgiQGvy9apoE78BWYdnsD8Q3Ekwag6lFqp > yUwt/RcRXS1PbLG4EGFW > =HTvW > -----END PGP SIGNATURE----- > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : [email protected] > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >
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