That's the behavior I would expect. On Mar 16, 2013 6:58 AM, "Tmusic" <tmusic...@gmail.com> wrote:
> 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. >> > > > > >> > > >> > >
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