Your setup sounds fine. My experiment used minimum-length TCP flows. In different tests, they were to ports that had no listener or that did have a listener that closed each new connection immediately. So they only had one packet in each direction, or only a few, respectively. Every connection used a different source/dest port combination.
My test maintained a sort of window on connection attempts. At most N connection attempts were allowed to be outstanding at a given time. When one completed (succeeded or failed) another one would start. If your test instead sends all of the packets together in a clump, then I would expect that you would lose some packets. On Tue, May 31, 2011 at 07:03:42PM +0200, Jose Luis Franco Arza wrote: > I am using the kernel version of OpenVswitch following the instructions > explained in the installation file. First of all installing the module, then > adding the datapath, the interfaces and finally executing the ovs-openflowd > command with the datapath and the ip of the nox controller to stablish the > connection. > When I tried to test the OpenVswitch I just stopped the nox controller > process and I installed the following entry in the flow table: > > sudo ovs-ofctl add-flow dp1 "in_port=1 nw_src=* nw_dst=* idle_timeout=500 > action=output:2" > May 27 21:46:27|00191|ofp_util|INFO|normalization changed ofp_match, > details: > May 27 21:46:27|00192|ofp_util|INFO| pre: wildcards= 0x3820fe in_port= > 1 dl_src=00:00:00:00:00:00 dl_dst=00:00:00:00:00:00 dl_vlan= 0 > dl_vlan_pcp= 0 dl_type= 0 nw_tos= 0 nw_proto= 0 nw_src= > 0 nw_dst= 0 tp_src= 0 tp_dst= 0 > May 27 21:46:27|00193|ofp_util|INFO|post: wildcards= 0x3ffffe in_port= > 1 dl_src=00:00:00:00:00:00 dl_dst=00:00:00:00:00:00 dl_vlan= 0 > dl_vlan_pcp= 0 dl_type= 0 nw_tos= 0 nw_proto= 0 nw_src= > 0 nw_dst= 0 tp_src= 0 tp_dst= 0 > > Every packet comming from port one would go out by the port 2. After that I > started the pktgen program to generate the traffic and I did several > experiments changing the packet rate and the results obtained were the ones > of the graphics I attached. > The only difference could be the line I commented in the connmgr.c file, but > I also tried few experiments without it commented and the results were the > same. > You told that you were able to forward around 200,000 flows/sec through the > OpenVSwitch, didn't you?Were you changing also the udp port per packet or > another field?though that shouldn't have any repercussion, no? > > Thank you for your help, > > Regards > > 2011/5/31 Ben Pfaff <[email protected]> > > > On Sat, May 28, 2011 at 06:50:25PM +0200, Jose Luis Franco Arza wrote: > > > I have been doing a small research about how many flows per second could > > > handle the NOX controller and the surprise was that the bottleneck was in > > > the OpenVSwitch. > > > When trying to install 20000 flows (modifying the UDP port number per > > packet > > > sent) after reaching the rate of 2000 packets per second then the > > > ovs-openflowd wasn't able to handel all the income packets and it started > > to > > > appear packet lost. > > > > Are you using the kernel or userspace version of the switch? If you > > are using the userspace version, perhaps it would behave this poorly. > > The userspace version is just for quick-and-dirty ports and simple > > testing. It is not a production switch. I have not tested its > > performance. > > > > The kernel version of the switch should perform much better than > > this. If I recall correctly, my own test results from last year > > were closer to 200,000 unique flow setups per second. If you are > > using the kernel version of the switch and only get 2,000 per second, > > then something is seriously wrong. > > > > What is in your OpenFlow flow table? How many flows, and what > > wildcards do they have? > > > > > So, I decided to try withot the existance of the NOX controller > > installing a > > > unique flow that would forward every packet in through the output port > > using > > > the wildcards. And the results said that the openvswitch is not able to > > > handle more than 2000 flows/sec. > > > > That doesn't make sense. > > > > P.S. You aren't running both ovs-openflowd and ovs-vswitchd, are you? > > Sometimes people make that mistake. > > > _______________________________________________ > discuss mailing list > [email protected] > http://openvswitch.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
