Thanks for verifying the behavior. I did some further testing and found a bug in my openflow controller. Sorry for bothering you with this...
The flow counters are now updated every second. The port counters seem to update almost instantaneous (now ping -i 0.01) and measuring every 10ms and it's updated with every measurement. Is this the correct behavior? 2013/3/16 Ben Pfaff <b...@nicira.com> > I ran a test. I set up an Open vSwitch switch (from current Git > "master") between two nodes, connected to "ovs-controller" as an > OpenFlow controller. I ran "ping -i.1" between them, to transmit 10 > ICMP echo requests and replies per second. On the switch, I ran > "watch -n1 ovs-ofctl dump-flows br0", to see how the flow counters are > updated once per second. The results were that I saw the packet > counters for the two flows (requests and replies) incrementing by > about 10 packets for each refresh, as I expected. > > I don't see a problem. > > On Fri, Mar 15, 2013 at 10:11:19PM +0100, Tmusic wrote: > > 2 hosts directly connected to a machine running ovs. The openflow > > controller (POX) runs on yet another machine. All bare metal, no VMs. > > > > The goal is to measure the traffic passing through the switch using the > > openflow protocol. > > > > Versions: > > Open vSwitch 1.7.3 > > Ubuntu 11.04 > > Kernel 2.6.38-11-generic-pae > > > > > > > > > > 2013/3/15 Ben Pfaff <b...@nicira.com> > > > > > Open vSwitch determines the interval. > > > > > > What is your test case? > > > > > > On Fri, Mar 15, 2013 at 09:57:22PM +0100, Tmusic wrote: > > > > I checked it multiple times and it seems to be 2.5-2.6s on average > > > > openvswitch is polled for its counters using the openflow protocol > > > > > > > > Is this interval determined by openvswitch or by the linux kernel? > > > > > > > > Thanks! > > > > > > > > > > > > 2013/3/15 Ben Pfaff <b...@nicira.com> > > > > > > > > > On Fri, Mar 15, 2013 at 09:24:05PM +0100, Tmusic wrote: > > > > > > I'm polling the port the stat counters of openvswitch (with > kernel > > > > > module) > > > > > > and noticed that they are only updated about every 2.5s. > > > > > > > > > > They should be updated about once a second. I'm surprised that you > > > > > see anything different. > > > > > > > > >
_______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
